Inspector-iOS-7.0.json

            {
                "name": "setRuleSelector",
                "parameters": [
                    { "name": "ruleId", "$ref": "CSSRuleId" },
                    { "name": "selector", "type": "string" }
                ],
                "returns": [
                    { "name": "rule", "$ref": "CSSRule", "description": "The resulting rule after the selector modification." }
                ],
                "description": "Modifies the rule selector."
            },
            {
                "name": "addRule",
                "parameters": [
                    { "name": "contextNodeId", "$ref": "DOM.NodeId" },
                    { "name": "selector", "type": "string" }
                ],
                "returns": [
                    { "name": "rule", "$ref": "CSSRule", "description": "The newly created rule." }
                ],
                "description": "Creates a new empty rule with the given <code>selector</code> in a special \"inspector\" stylesheet in the owner document of the context node."
            },
            {
                "name": "getSupportedCSSProperties",
                "returns": [
                    { "name": "cssProperties", "type": "array", "items": { "$ref": "CSSPropertyInfo" }, "description": "Supported property metainfo." }
                ],
                "description": "Returns all supported CSS property names."
            },
            {
                "name": "forcePseudoState",
                "parameters": [
                    { "name": "nodeId", "$ref": "DOM.NodeId", "description": "The element id for which to force the pseudo state." },
                    { "name": "forcedPseudoClasses", "type": "array", "items": { "type": "string", "enum": ["active", "focus", "hover", "visited"] }, "description": "Element pseudo classes to force when computing the element's style." }
                ],
                "description": "Ensures that the given node will have specified pseudo-classes whenever its style is computed by the browser."
            },
            {
                "name": "startSelectorProfiler"
            },
            {
                "name": "stopSelectorProfiler",
                "returns": [
                    { "name": "profile", "$ref": "SelectorProfile" }
                ]
            },
            {
                "name": "getNamedFlowCollection",
                "parameters": [
                    { "name": "documentNodeId", "$ref": "DOM.NodeId", "description": "The document node id for which to get the Named Flow Collection." }
                ],
                "returns": [
                    { "name": "namedFlows", "type": "array", "items": { "$ref": "NamedFlow" }, "description": "An array containing the Named Flows in the document." }
                ],
                "description": "Returns the Named Flows from the document."
            }
        ],
        "events": [
            {
                "name": "mediaQueryResultChanged",
                "description": "Fires whenever a MediaQuery result changes (for example, after a browser window has been resized.) The current implementation considers only viewport-dependent media features."
            },
            {
                "name": "styleSheetChanged",
                "parameters": [
                    { "name": "styleSheetId", "$ref": "StyleSheetId" }
                ],
                "description": "Fired whenever a stylesheet is changed as a result of the client operation."
            },
            {
                "name": "namedFlowCreated",
                "parameters": [
                    { "name": "namedFlow", "$ref": "NamedFlow", "description": "The new Named Flow." }
                ],
                "description": "Fires when a Named Flow is created."
            },
            {
                "name": "namedFlowRemoved",
                "parameters": [
                    { "name": "documentNodeId", "$ref": "DOM.NodeId", "description": "The document node id." },
                    { "name": "flowName", "type": "string", "description": "Identifier of the removed Named Flow." }
                ],
                "description": "Fires when a Named Flow is removed: has no associated content nodes and regions."
            },
            {
                "name": "regionLayoutUpdated",
                "parameters": [
                    { "name": "namedFlow", "$ref": "NamedFlow", "description": "The Named Flow whose layout may have changed." }
                ],
                "description": "Fires when a Named Flow's layout may have changed."
            }
        ]
    },
    {
        "domain": "Timeline",
        "description": "Timeline provides its clients with instrumentation records that are generated during the page runtime. Timeline instrumentation can be started and stopped using corresponding commands. While timeline is started, it is generating timeline event records.",
        "types": [
            {
                "id": "EventType",
                "type": "string",
                "enum": ["EventDispatch", "ScheduleStyleRecalculation", "RecalculateStyles", "InvalidateLayout", "Layout", "Paint", "ResizeImage", "ParseHTML", "TimerInstall", "TimerRemove", "TimerFire", "EvaluateScript", "MarkLoad", "MarkDOMContent", "TimeStamp", "Time", "TimeEnd", "ScheduleResourceRequest", "ResourceSendRequest", "ResourceReceiveResponse", "ResourceReceivedData", "ResourceFinish", "XHRReadyStateChange", "XHRLoad", "FunctionCall", "RequestAnimationFrame", "CancelAnimationFrame", "FireAnimationFrame", "WebSocketCreate", "WebSocketSendHandshakeRequest", "WebSocketReceiveHandshakeResponse", "WebSocketDestroy"],
                "description": "Timeline record type."
            },
            {
                "id": "TimelineEvent",
                "type": "object",
                "properties": [
                    { "name": "type", "type": "string", "description": "Event type." },
                    { "name": "data", "type": "object", "description": "Event data." },
                    { "name": "children", "type": "array", "optional": true, "items": { "$ref": "TimelineEvent" }, "description": "Nested records." }
                ],
                "description": "Timeline record contains information about the recorded activity."
            }
        ],
        "commands": [
            {
                "name": "start",
                "parameters": [
                    { "name": "maxCallStackDepth", "optional": true, "type": "integer", "description": "Samples JavaScript stack traces up to <code>maxCallStackDepth</code>, defaults to 5." }
                ],
                "description": "Starts capturing instrumentation events."
            },
            {
                "name": "stop",
                "description": "Stops capturing instrumentation events."
            }
        ],
        "events": [
            {
                "name": "eventRecorded",
                "parameters": [
                    { "name": "record", "$ref": "TimelineEvent", "description": "Timeline event record data." }
                ],
                "description": "Fired for every instrumentation event while timeline is started."
            }
        ]
    },
    {
        "domain": "Debugger",
        "description": "Debugger domain exposes JavaScript debugging capabilities. It allows setting and removing breakpoints, stepping through execution, exploring stack traces, etc.",
        "types": [
            {
                "id": "BreakpointId",
                "type": "string",
                "description": "Breakpoint identifier."
            },
            {
                "id": "ScriptId",
                "type": "string",
                "description": "Unique script identifier."
            },
            {
                "id": "CallFrameId",
                "type": "string",
                "description": "Call frame identifier."
            },
            {
                "id": "Location",
                "type": "object",
                "properties": [
                    { "name": "scriptId", "$ref": "ScriptId", "description": "Script identifier as reported in the <code>Debugger.scriptParsed</code>." },
                    { "name": "lineNumber", "type": "integer", "description": "Line number in the script." },
                    { "name": "columnNumber", "type": "integer", "optional": true, "description": "Column number in the script." }
                ],
                "description": "Location in the source code."
            },
            {
                "id": "FunctionDetails",
                "type": "object",
                "properties": [
                    { "name": "location", "$ref": "Location", "description": "Location of the function." },
                    { "name": "name", "type": "string", "optional": true, "description": "Name of the function. Not present for anonymous functions." },
                    { "name": "displayName", "type": "string", "optional": true, "description": "Display name of the function(specified in 'displayName' property on the function object)." },
                    { "name": "inferredName", "type": "string", "optional": true, "description": "Name of the function inferred from its initial assignment." },
                    { "name": "scopeChain", "type": "array", "optional": true, "items": { "$ref": "Scope" }, "description": "Scope chain for this closure." }
                ],
                "description": "Information about the function."
            },
            {
                "id": "CallFrame",
                "type": "object",
                "properties": [
                    { "name": "callFrameId", "$ref": "CallFrameId", "description": "Call frame identifier. This identifier is only valid while the virtual machine is paused." },
                    { "name": "functionName", "type": "string", "description": "Name of the JavaScript function called on this call frame." },
                    { "name": "location", "$ref": "Location", "description": "Location in the source code." },
                    { "name": "scopeChain", "type": "array", "items": { "$ref": "Scope" }, "description": "Scope chain for this call frame." },
                    { "name": "this", "$ref": "Runtime.RemoteObject", "description": "<code>this</code> object for this call frame." }
                ],
                "description": "JavaScript call frame. Array of call frames form the call stack."
            },
            {
                "id": "Scope",
                "type": "object",
                "properties": [
                    { "name": "type", "type": "string", "enum": ["global", "local", "with", "closure", "catch"], "description": "Scope type." },
                    { "name": "object", "$ref": "Runtime.RemoteObject", "description": "Object representing the scope. For <code>global</code> and <code>with</code> scopes it represents the actual object; for the rest of the scopes, it is artificial transient object enumerating scope variables as its properties." }
                ],
                "description": "Scope description."
            }
        ],
        "commands": [
            {
                "name": "enable",
                "description": "Enables debugger for the given page. Clients should not assume that the debugging has been enabled until the result for this command is received."
            },
            {
                "name": "disable",
                "description": "Disables debugger for given page."
            },
            {
                "name": "setBreakpointsActive",
                "parameters": [
                    { "name": "active", "type": "boolean", "description": "New value for breakpoints active state." }
                ],
                "description": "Activates / deactivates all breakpoints on the page."
            },
            {
                "name": "setBreakpointByUrl",
                "parameters": [
                    { "name": "lineNumber", "type": "integer", "description": "Line number to set breakpoint at." },
                    { "name": "url", "type": "string", "optional": true, "description": "URL of the resources to set breakpoint on." },
                    { "name": "urlRegex", "type": "string", "optional": true, "description": "Regex pattern for the URLs of the resources to set breakpoints on. Either <code>url</code> or <code>urlRegex</code> must be specified." },
                    { "name": "columnNumber", "type": "integer", "optional": true, "description": "Offset in the line to set breakpoint at." },
                    { "name": "condition", "type": "string", "optional": true, "description": "Expression to use as a breakpoint condition. When specified, debugger will only stop on the breakpoint if this expression evaluates to true." }
                ],
                "returns": [
                    { "name": "breakpointId", "$ref": "BreakpointId", "description": "Id of the created breakpoint for further reference." },
                    { "name": "locations", "type": "array", "items": { "$ref": "Location"}, "description": "List of the locations this breakpoint resolved into upon addition." }
                ],
                "description": "Sets JavaScript breakpoint at given location specified either by URL or URL regex. Once this command is issued, all existing parsed scripts will have breakpoints resolved and returned in <code>locations</code> property. Further matching script parsing will result in subsequent <code>breakpointResolved</code> events issued. This logical breakpoint will survive page reloads."
            },
            {
                "name": "setBreakpoint",
                "parameters": [
                    { "name": "location", "$ref": "Location", "description": "Location to set breakpoint in." },
                    { "name": "condition", "type": "string", "optional": true, "description": "Expression to use as a breakpoint condition. When specified, debugger will only stop on the breakpoint if this expression evaluates to true." }
                ],
                "returns": [
                    { "name": "breakpointId", "$ref": "BreakpointId", "description": "Id of the created breakpoint for further reference." },
                    { "name": "actualLocation", "$ref": "Location", "description": "Location this breakpoint resolved into." }
                ],
                "description": "Sets JavaScript breakpoint at a given location."
            },
            {
                "name": "removeBreakpoint",
                "parameters": [
                    { "name": "breakpointId", "$ref": "BreakpointId" }
                ],
                "description": "Removes JavaScript breakpoint."
            },
            {
                "name": "continueToLocation",
                "parameters": [
                    { "name": "location", "$ref": "Location", "description": "Location to continue to." }
                ],
                "description": "Continues execution until specific location is reached."
            },
            {
                "name": "stepOver",
                "description": "Steps over the statement."
            },
            {
                "name": "stepInto",
                "description": "Steps into the function call."
            },
            {
                "name": "stepOut",
                "description": "Steps out of the function call."
            },
            {
                "name": "pause",
                "description": "Stops on the next JavaScript statement."
            },
            {
                "name": "resume",
                "description": "Resumes JavaScript execution."
            },
            {
                "name": "searchInContent",
                "parameters": [
                    { "name": "scriptId", "$ref": "ScriptId", "description": "Id of the script to search in." },
                    { "name": "query", "type": "string", "description": "String to search for."  },
                    { "name": "caseSensitive", "type": "boolean", "optional": true, "description": "If true, search is case sensitive." },
                    { "name": "isRegex", "type": "boolean", "optional": true, "description": "If true, treats string parameter as regex." }
                ],
                "returns": [
                    { "name": "result", "type": "array", "items": { "$ref": "Page.SearchMatch" }, "description": "List of search matches." }
                ],
                "description": "Searches for given string in script content."
            },
            {
                "name": "restartFrame",
                "parameters": [
                    { "name": "callFrameId", "$ref": "CallFrameId", "description": "Call frame identifier to evaluate on." }
                ],
                "returns": [
                    { "name": "callFrames", "type": "array", "items": { "$ref": "CallFrame"}, "description": "New stack trace." },
                    { "name": "result", "type": "object", "description": "VM-specific description." }
                ],
                "description": "Restarts particular call frame from the beginning."
            },
            {
                "name": "getScriptSource",
                "parameters": [
                    { "name": "scriptId", "$ref": "ScriptId", "description": "Id of the script to get source for." }
                ],
                "returns": [
                    { "name": "scriptSource", "type": "string", "description": "Script source." }
                ],
                "description": "Returns source for the script with given id."
            },
            {
                "name": "getFunctionDetails",
                "parameters": [
                    { "name": "functionId", "$ref": "Runtime.RemoteObjectId", "description": "Id of the function to get location for." }
                ],
                "returns": [
                    { "name": "details", "$ref": "FunctionDetails", "description": "Information about the function." }
                ],
                "description": "Returns detailed informtation on given function."
            },
            {
                "name": "setPauseOnExceptions",
                "parameters": [
                    { "name": "state", "type": "string", "enum": ["none", "uncaught", "all"], "description": "Pause on exceptions mode." }
                ],
                "description": "Defines pause on exceptions state. Can be set to stop on all exceptions, uncaught exceptions or no exceptions. Initial pause on exceptions state is <code>none</code>."
            },
            {
                "name": "evaluateOnCallFrame",
                "parameters": [
                    { "name": "callFrameId", "$ref": "CallFrameId", "description": "Call frame identifier to evaluate on." },
                    { "name": "expression", "type": "string", "description": "Expression to evaluate." },
                    { "name": "objectGroup", "type": "string", "optional": true, "description": "String object group name to put result into (allows rapid releasing resulting object handles using <code>releaseObjectGroup</code>)." },
                    { "name": "includeCommandLineAPI", "type": "boolean", "optional": true, "description": "Specifies whether command line API should be available to the evaluated expression, defaults to false." },
                    { "name": "doNotPauseOnExceptionsAndMuteConsole", "type": "boolean", "optional": true, "description": "Specifies whether evaluation should stop on exceptions and mute console. Overrides setPauseOnException state." },
                    { "name": "returnByValue", "type": "boolean", "optional": true, "description": "Whether the result is expected to be a JSON object that should be sent by value." },
                    { "name": "generatePreview", "type": "boolean", "optional": true,  "description": "Whether preview should be generated for the result." }
                ],
                "returns": [
                    { "name": "result", "$ref": "Runtime.RemoteObject", "description": "Object wrapper for the evaluation result." },
                    { "name": "wasThrown", "type": "boolean", "optional": true, "description": "True if the result was thrown during the evaluation." }
                ],
                "description": "Evaluates expression on a given call frame."
            },
            {
                "name": "setOverlayMessage",
                "parameters": [
                    { "name": "message", "type": "string", "optional": true, "description": "Overlay message to display when paused in debugger." }
                ],
                "description": "Sets overlay message."
            },
            {
                "name": "setVariableValue",
                "parameters": [
                    { "name": "scopeNumber", "type": "integer", "description": "0-based number of scope as was listed in scope chain. Only 'local', 'closure' and 'catch' scope types are allowed. Other scopes could be manipulated manually." },
                    { "name": "variableName", "type": "string", "description": "Variable name." },
                    { "name": "newValue", "$ref": "Runtime.CallArgument", "description": "New variable value." },
                    { "name": "callFrameId", "$ref": "CallFrameId", "optional": true, "description": "Id of callframe that holds variable." },
                    { "name": "functionObjectId", "$ref": "Runtime.RemoteObjectId", "optional": true, "description": "Object id of closure (function) that holds variable." }
                ],
                "description": "Changes value of variable in a callframe or a closure. Either callframe or function must be specified. Object-based scopes are not supported and must be mutated manually."
            }
        ],
        "events": [
            {
                "name": "globalObjectCleared",
                "description": "Called when global has been cleared and debugger client should reset its state. Happens upon navigation or reload."
            },
            {
                "name": "scriptParsed",
                "parameters": [
                    { "name": "scriptId", "$ref": "ScriptId", "description": "Identifier of the script parsed." },
                    { "name": "url", "type": "string", "description": "URL or name of the script parsed (if any)." },
                    { "name": "startLine", "type": "integer", "description": "Line offset of the script within the resource with given URL (for script tags)." },
                    { "name": "startColumn", "type": "integer", "description": "Column offset of the script within the resource with given URL." },
                    { "name": "endLine", "type": "integer", "description": "Last line of the script." },
                    { "name": "endColumn", "type": "integer", "description": "Length of the last line of the script." },
                    { "name": "isContentScript", "type": "boolean", "optional": true, "description": "Determines whether this script is a user extension script." },
                    { "name": "sourceMapURL", "type": "string", "optional": true, "description": "URL of source map associated with script (if any)." },
                    { "name": "hasSourceURL", "type": "boolean", "optional": true, "description": "True, if this script has sourceURL." }
                ],
                "description": "Fired when virtual machine parses script. This event is also fired for all known and uncollected scripts upon enabling debugger."
            },
            {
                "name": "scriptFailedToParse",
                "parameters": [
                    { "name": "url", "type": "string", "description": "URL of the script that failed to parse." },
                    { "name": "scriptSource", "type": "string", "description": "Source text of the script that failed to parse." },
                    { "name": "startLine", "type": "integer", "description": "Line offset of the script within the resource." },
                    { "name": "errorLine", "type": "integer", "description": "Line with error." },
                    { "name": "errorMessage", "type": "string", "description": "Parse error message." }
                ],
                "description": "Fired when virtual machine fails to parse the script."
            },
            {
                "name": "breakpointResolved",
                "parameters": [
                    { "name": "breakpointId", "$ref": "BreakpointId", "description": "Breakpoint unique identifier." },
                    { "name": "location", "$ref": "Location", "description": "Actual breakpoint location." }
                ],
                "description": "Fired when breakpoint is resolved to an actual script and location."
            },
            {
                "name": "paused",
                "parameters": [
                    { "name": "callFrames", "type": "array", "items": { "$ref": "CallFrame" }, "description": "Call stack the virtual machine stopped on." },
                    { "name": "reason", "type": "string", "enum": [ "XHR", "DOM", "EventListener", "exception", "assert", "CSPViolation", "other" ], "description": "Pause reason." },
                    { "name": "data", "type": "object", "optional": true, "description": "Object containing break-specific auxiliary properties." }
                ],
                "description": "Fired when the virtual machine stopped on breakpoint or exception or any other stop criteria."
            },
            {
                "name": "resumed",
                "description": "Fired when the virtual machine resumed execution."
            }
        ]
    },
    {
        "domain": "DOMDebugger",
        "description": "DOM debugging allows setting breakpoints on particular DOM operations and events. JavaScript execution will stop on these operations as if there was a regular breakpoint set.",
        "types": [
            {
                "id": "DOMBreakpointType",
                "type": "string",
                "enum": ["subtree-modified", "attribute-modified", "node-removed"],
                "description": "DOM breakpoint type."
            }
        ],
        "commands": [
            {
                "name": "setDOMBreakpoint",
                "parameters": [
                    { "name": "nodeId", "$ref": "DOM.NodeId", "description": "Identifier of the node to set breakpoint on." },
                    { "name": "type", "$ref": "DOMBreakpointType", "description": "Type of the operation to stop upon." }
                ],
                "description": "Sets breakpoint on particular operation with DOM."
            },
            {
                "name": "removeDOMBreakpoint",
                "parameters": [
                    { "name": "nodeId", "$ref": "DOM.NodeId", "description": "Identifier of the node to remove breakpoint from." },
                    { "name": "type", "$ref": "DOMBreakpointType", "description": "Type of the breakpoint to remove." }
                ],
                "description": "Removes DOM breakpoint that was set using <code>setDOMBreakpoint</code>."
            },
            {
                "name": "setEventListenerBreakpoint",
                "parameters": [
                    { "name": "eventName", "type": "string", "description": "DOM Event name to stop on (any DOM event will do)." }
                ],
                "description": "Sets breakpoint on particular DOM event."
            },
            {
                "name": "removeEventListenerBreakpoint",
                "parameters": [
                    { "name": "eventName", "type": "string", "description": "Event name." }
                ],
                "description": "Removes breakpoint on particular DOM event."
            },
            {
                "name": "setInstrumentationBreakpoint",
                "parameters": [
                    { "name": "eventName", "type": "string", "description": "Instrumentation name to stop on." }
                ],
                "description": "Sets breakpoint on particular native event."
            },
            {
                "name": "removeInstrumentationBreakpoint",
                "parameters": [
                    { "name": "eventName", "type": "string", "description": "Instrumentation name to stop on." }
                ],
                "description": "Sets breakpoint on particular native event."
            },
            {
                "name": "setXHRBreakpoint",
                "parameters": [
                    { "name": "url", "type": "string", "description": "Resource URL substring. All XHRs having this substring in the URL will get stopped upon." }
                ],
                "description": "Sets breakpoint on XMLHttpRequest."
            },
            {
                "name": "removeXHRBreakpoint",
                "parameters": [
                    { "name": "url", "type": "string", "description": "Resource URL substring." }
                ],
                "description": "Removes breakpoint from XMLHttpRequest."
            }
        ]
    },
    {
        "domain": "Profiler",
        "types": [
            {
                "id": "ProfileHeader",
                "type": "object",
                "description": "Profile header.",
                "properties": [
                    { "name": "typeId", "type": "string", "enum": ["CPU", "CSS"], "description": "Profile type name." },
                    { "name": "title", "type": "string", "description": "Profile title." },
                    { "name": "uid", "type": "integer", "description": "Unique identifier of the profile." }
                ]
            },
            {
                "id": "CPUProfileNode",
                "type": "object",
                "description": "CPU Profile node. Holds callsite information, execution statistics and child nodes.",
                "properties": [
                    { "name": "functionName", "type": "string", "description": "Function name." },
                    { "name": "url", "type": "string", "description": "URL." },
                    { "name": "lineNumber", "type": "integer", "description": "Line number." },
                    { "name": "totalTime", "type": "number", "description": "Total execution time." },
                    { "name": "selfTime", "type": "number", "description": "Self time." },
                    { "name": "numberOfCalls", "type": "integer", "description": "Number of calls." },
                    { "name": "callUID", "type": "number", "description": "Call UID." },
                    { "name": "children", "type": "array", "items": { "$ref": "CPUProfileNode" }, "description": "Child nodes." },
                    { "name": "id", "optional": true, "type": "integer", "description": "Unique id of the node." }
                ]
            },
            {
                "id": "CPUProfile",
                "type": "object",
                "description": "Profile.",
                "properties": [
                    { "name": "head", "$ref": "CPUProfileNode", "optional": true },
                    { "name": "idleTime", "type": "number", "optional": true }
                ]
            }
        ],
        "commands": [
            {
                "name": "enable"
            },
            {
                "name": "disable"
            },
            {
                "name": "start"
            },
            {
                "name": "stop"
            },
            {
                "name": "getProfileHeaders",
                "returns": [
                    { "name": "headers", "type": "array", "items": { "$ref": "ProfileHeader"} }
                ]
            },
            {
                "name": "getCPUProfile",
                "parameters": [
                    { "name": "uid", "type": "integer" }
                ],
                "returns": [
                    { "name": "profile", "$ref": "CPUProfile" }
                ]
            },
            {
                "name": "removeProfile",
                "parameters": [
                    { "name": "type", "type": "string" },
                    { "name": "uid", "type": "integer" }
                ]
            },
            {
                "name": "clearProfiles"
            }
        ],
        "events": [
            {
                "name": "addProfileHeader",
                "parameters": [
                    { "name": "header", "$ref": "ProfileHeader" }
                ]
            },
            {
                "name": "setRecordingProfile",
                "parameters": [
                    { "name": "isProfiling", "type": "boolean" }
                ]
            },
            {
                "name": "resetProfiles"
            }
        ]
    },
    {
        "domain": "LayerTree",
        "types": [
            {
                "id": "LayerId",
                "type": "string",
                "description": "Unique RenderLayer identifier."
            },
            {
                "id": "PseudoElementId",
                "type": "string",
                "description": "Unique PseudoElement identifier."
            },
            {
                "id": "IntRect",
                "type": "object",
                "description": "A rectangle.",
                "properties": [
                    { "name": "x", "type": "integer", "description": "The x position." },
                    { "name": "y", "type": "integer", "description": "The y position." },
                    { "name": "width", "type": "integer", "description": "The width metric." },
                    { "name": "height", "type": "integer", "description": "The height metric." }
                ]
            },
            {
                "id": "Layer",
                "type": "object",
                "description": "Information about a compositing layer.",
                "properties": [
                    { "name": "layerId", "$ref": "LayerId", "description": "The unique id for this layer." },
                    { "name": "nodeId", "$ref": "DOM.NodeId", "description": "The id for the node associated with this layer." },
                    { "name": "bounds", "$ref": "IntRect", "description": "Bounds of the layer in absolute page coordinates." },
                    { "name": "paintCount", "type": "integer", "description": "Indicates how many time this layer has painted." },
                    { "name": "memory", "type": "integer", "description": "Estimated memory used by this layer." },
                    { "name": "compositedBounds", "$ref": "IntRect", "description": "The bounds of the composited layer." },
                    { "name": "isInShadowTree", "type": "boolean", "optional": true, "description": "Indicates whether this layer is associated with an element hosted in a shadow tree." },
                    { "name": "isReflection", "type": "boolean", "optional": true, "description": "Indicates whether this layer was used to provide a reflection for the element." },
                    { "name": "isGeneratedContent", "type": "boolean", "optional": true, "description": "Indicates whether the layer is attached to a pseudo element that is CSS generated content." },
                    { "name": "isAnonymous", "type": "boolean", "optional": true, "description": "Indicates whether the layer was created for a CSS anonymous block or box." },
                    { "name": "pseudoElementId", "$ref": "PseudoElementId", "optional": true, "description": "The id for the pseudo element associated with this layer." },
                    { "name": "pseudoElement", "type": "string", "optional": true, "description": "The name of the CSS pseudo-element that prompted the layer to be generated." }
                ]
            },
            {
                "id": "CompositingReasons",
                "type": "object",
                "description": "An object containing the reasons why the layer was composited as properties.",
                "properties": [
                    { "name": "transform3D", "type": "boolean", "optional": true, "description": "Composition due to association with an element with a CSS 3D transform." },
                    { "name": "video", "type": "boolean", "optional": true, "description": "Composition due to association with a <video> element." },
                    { "name": "canvas", "type": "boolean", "optional": true, "description": "Composition due to the element being a <canvas> element." },
                    { "name": "plugin", "type": "boolean", "optional": true, "description": "Composition due to association with a plugin." },
                    { "name": "iFrame", "type": "boolean", "optional": true, "description": "Composition due to association with an <iframe> element." },
                    { "name": "backfaceVisibilityHidden", "type": "boolean", "optional": true, "description": "Composition due to association with an element with a \"backface-visibility: hidden\" style." },
                    { "name": "clipsCompositingDescendants", "type": "boolean", "optional": true, "description": "Composition due to association with an element clipping compositing descendants." },
                    { "name": "animation", "type": "boolean", "optional": true, "description": "Composition due to association with an animated element." },
                    { "name": "filters", "type": "boolean", "optional": true, "description": "Composition due to association with an element with CSS filters applied." },
                    { "name": "positionFixed", "type": "boolean", "optional": true, "description": "Composition due to association with an element with a \"position: fixed\" style." },
                    { "name": "positionSticky", "type": "boolean", "optional": true, "description": "Composition due to association with an element with a \"position: sticky\" style." },
                    { "name": "overflowScrollingTouch", "type": "boolean", "optional": true, "description": "Composition due to association with an element with a \"overflow-scrolling: touch\" style." },
                    { "name": "stacking", "type": "boolean", "optional": true, "description": "Composition due to association with an element establishing a stacking context." },
                    { "name": "overlap", "type": "boolean", "optional": true, "description": "Composition due to association with an element overlapping other composited elements." },
                    { "name": "negativeZIndexChildren", "type": "boolean", "optional": true, "description": "Composition due to association with an element with descendants that have a negative z-index." },
                    { "name": "transformWithCompositedDescendants", "type": "boolean", "optional": true, "description": "Composition due to association with an element with composited descendants." },
                    { "name": "opacityWithCompositedDescendants", "type": "boolean", "optional": true, "description": "Composition due to association with an element with opacity applied and composited descendants." },
                    { "name": "maskWithCompositedDescendants", "type": "boolean", "optional": true, "description": "Composition due to association with a masked element and composited descendants." },
                    { "name": "reflectionWithCompositedDescendants", "type": "boolean", "optional": true, "description": "Composition due to association with an element with a reflection and composited descendants." },
                    { "name": "filterWithCompositedDescendants", "type": "boolean", "optional": true, "description": "Composition due to association with an element with CSS filters applied and composited descendants." },
                    { "name": "blendingWithCompositedDescendants", "type": "boolean", "optional": true, "description": "Composition due to association with an element with CSS blending applied and composited descendants." },
                    { "name": "perspective", "type": "boolean", "optional": true, "description": "Composition due to association with an element with perspective applied." },
                    { "name": "preserve3D", "type": "boolean", "optional": true, "description": "Composition due to association with an element with a \"transform-style: preserve-3d\" style." },
                    { "name": "root", "type": "boolean", "optional": true, "description": "Composition due to association with the root element." }
                ]
            }
        ],
        "commands": [
            {
                "name": "enable",
                "description": "Enables compositing tree inspection."
            },
            {
                "name": "disable",
                "description": "Disables compositing tree inspection."
            },
            {
                "name": "layersForNode",
                "parameters": [
                    { "name": "nodeId", "$ref": "DOM.NodeId", "description": "Root of the subtree for which we want to gather layers." }                ],
                "description": "Returns the layer tree structure of the current page.",
                "returns": [
                    { "name": "layers", "type": "array", "items": { "$ref": "Layer" }, "description": "Child layers." }
                ]
            },
            {
                "name": "reasonsForCompositingLayer",
                "parameters": [
                    { "name": "layerId", "$ref": "LayerId", "description": "The id of the layer for which we want to get the reasons it was composited." }
                ],
                "description": "Provides the reasons why the given layer was composited.",
                "returns": [
                    { "name": "compositingReasons", "$ref": "CompositingReasons", "description": "An object containing the reasons why the layer was composited as properties." }
                ]
            }
        ],
        "events": [
            {
                "name": "layerTreeDidChange"
            }
        ]
    }]
}