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diff --git a/dom/webidl/Console.webidl b/dom/webidl/Console.webidl
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+++ b/dom/webidl/Console.webidl
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+/* -*- Mode: IDL; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * For more information on this interface, please see
+ * https://console.spec.whatwg.org/#console-namespace
+ */
+
+[Exposed=(Window,Worker,WorkerDebugger,Worklet),
+ ClassString="Console",
+ ProtoObjectHack]
+namespace console {
+
+  // NOTE: if you touch this namespace, remember to update the ConsoleInstance
+  // interface as well!
+
+  // Logging
+  [UseCounter]
+  undefined assert(optional boolean condition = false, any... data);
+  [UseCounter]
+  undefined clear();
+  [UseCounter]
+  undefined count(optional DOMString label = "default");
+  [UseCounter]
+  undefined countReset(optional DOMString label = "default");
+  [UseCounter]
+  undefined debug(any... data);
+  [UseCounter]
+  undefined error(any... data);
+  [UseCounter]
+  undefined info(any... data);
+  [UseCounter]
+  undefined log(any... data);
+  [UseCounter]
+  undefined table(any... data); // FIXME: The spec is still unclear about this.
+  [UseCounter]
+  undefined trace(any... data);
+  [UseCounter]
+  undefined warn(any... data);
+  [UseCounter]
+  undefined dir(any... data); // FIXME: This doesn't follow the spec yet.
+  [UseCounter]
+  undefined dirxml(any... data);
+
+  // Grouping
+  [UseCounter]
+  undefined group(any... data);
+  [UseCounter]
+  undefined groupCollapsed(any... data);
+  [UseCounter]
+  undefined groupEnd();
+
+  // Timing
+  [UseCounter]
+  undefined time(optional DOMString label = "default");
+  [UseCounter]
+  undefined timeLog(optional DOMString label = "default", any... data);
+  [UseCounter]
+  undefined timeEnd(optional DOMString label = "default");
+
+  // Mozilla only or Webcompat methods
+
+  [UseCounter]
+  undefined _exception(any... data);
+  [UseCounter]
+  undefined timeStamp(optional any data);
+
+  [UseCounter]
+  undefined profile(any... data);
+  [UseCounter]
+  undefined profileEnd(any... data);
+
+  [ChromeOnly]
+  const boolean IS_NATIVE_CONSOLE = true;
+
+  [ChromeOnly, NewObject]
+  ConsoleInstance createInstance(optional ConsoleInstanceOptions options = {});
+};
+
+// This is used to propagate console events to the observers.
+[GenerateConversionToJS]
+dictionary ConsoleEvent {
+  (unsigned long long or DOMString) ID;
+  (unsigned long long or DOMString) innerID;
+  DOMString consoleID = "";
+  DOMString addonId = "";
+  DOMString level = "";
+  DOMString filename = "";
+  // Unique identifier within the process for the script source this event is
+  // associated with, or zero.
+  unsigned long sourceId = 0;
+  unsigned long lineNumber = 0;
+  unsigned long columnNumber = 0;
+  DOMString functionName = "";
+  double timeStamp = 0;
+  double microSecondTimeStamp = 0;
+  sequence<any> arguments;
+  sequence<DOMString?> styles;
+  boolean private = false;
+  // stacktrace is handled via a getter in some cases so we can construct it
+  // lazily.  Note that we're not making this whole thing an interface because
+  // consumers expect to see own properties on it, which would mean making the
+  // props unforgeable, which means lots of JSFunction allocations.  Maybe we
+  // should fix those consumers, of course....
+  // sequence<ConsoleStackEntry> stacktrace;
+  DOMString groupName = "";
+  any timer = null;
+  any counter = null;
+  DOMString prefix = "";
+  boolean chromeContext = false;
+};
+
+// Event for profile operations
+[GenerateConversionToJS]
+dictionary ConsoleProfileEvent {
+  DOMString action = "";
+  sequence<any> arguments;
+  boolean chromeContext = false;
+};
+
+// This dictionary is used to manage stack trace data.
+[GenerateConversionToJS]
+dictionary ConsoleStackEntry {
+  DOMString filename = "";
+  // Unique identifier within the process for the script source this entry is
+  // associated with, or zero.
+  unsigned long sourceId = 0;
+  unsigned long lineNumber = 0;
+  unsigned long columnNumber = 0;
+  DOMString functionName = "";
+  DOMString? asyncCause;
+};
+
+[GenerateConversionToJS]
+dictionary ConsoleTimerStart {
+  DOMString name = "";
+};
+
+[GenerateConversionToJS]
+dictionary ConsoleTimerLogOrEnd {
+  DOMString name = "";
+  double duration = 0;
+};
+
+[GenerateConversionToJS]
+dictionary ConsoleTimerError {
+  DOMString error = "";
+  DOMString name = "";
+};
+
+[GenerateConversionToJS]
+dictionary ConsoleCounter {
+  DOMString label = "";
+  unsigned long count = 0;
+};
+
+[GenerateConversionToJS]
+dictionary ConsoleCounterError {
+  DOMString label = "";
+  DOMString error = "";
+};
+
+[ChromeOnly,
+ Exposed=(Window,Worker,WorkerDebugger,Worklet)]
+// This is basically a copy of the console namespace.
+interface ConsoleInstance {
+  // Logging
+  undefined assert(optional boolean condition = false, any... data);
+  undefined clear();
+  undefined count(optional DOMString label = "default");
+  undefined countReset(optional DOMString label = "default");
+  undefined debug(any... data);
+  undefined error(any... data);
+  undefined info(any... data);
+  undefined log(any... data);
+  undefined table(any... data); // FIXME: The spec is still unclear about this.
+  undefined trace(any... data);
+  undefined warn(any... data);
+  undefined dir(any... data); // FIXME: This doesn't follow the spec yet.
+  undefined dirxml(any... data);
+
+  // Grouping
+  undefined group(any... data);
+  undefined groupCollapsed(any... data);
+  undefined groupEnd();
+
+  // Timing
+  undefined time(optional DOMString label = "default");
+  undefined timeLog(optional DOMString label = "default", any... data);
+  undefined timeEnd(optional DOMString label = "default");
+
+  // Mozilla only or Webcompat methods
+
+  undefined _exception(any... data);
+  undefined timeStamp(optional any data);
+
+  undefined profile(any... data);
+  undefined profileEnd(any... data);
+
+  // Returns true if the given level would log a message. Used for avoiding
+  // long/significant processing when logging messages.
+  boolean shouldLog(ConsoleLogLevel level);
+};
+
+callback ConsoleInstanceDumpCallback = undefined (DOMString message);
+
+enum ConsoleLogLevel {
+  "All", "Debug", "Log", "Info", "Clear", "Trace", "TimeLog", "TimeEnd", "Time",
+  "Group", "GroupEnd", "Profile", "ProfileEnd", "Dir", "Dirxml", "Warn", "Error",
+  "Off"
+};
+
+dictionary ConsoleInstanceOptions {
+  // An optional function to intercept all strings written to stdout.
+  ConsoleInstanceDumpCallback dump;
+
+  // An optional prefix string to be printed before the actual logged message.
+  DOMString prefix = "";
+
+  // An ID representing the source of the message. Normally the inner ID of a
+  // DOM window.
+  DOMString innerID = "";
+
+  // String identified for the console, this will be passed through the console
+  // notifications.
+  DOMString consoleID = "";
+
+  // Identifier that allows to filter which messages are logged based on their
+  // log level.
+  ConsoleLogLevel maxLogLevel;
+
+  // String pref name which contains the level to use for maxLogLevel. If the
+  // pref doesn't exist, gets removed or it is used in workers, the maxLogLevel
+  // will default to the value passed to this constructor (or "all" if it wasn't
+  // specified).
+  DOMString maxLogLevelPref = "";
+};
+
+enum ConsoleLevel { "log", "warning", "error" };
+
+// this interface is just for testing
+partial interface ConsoleInstance {
+  [ChromeOnly]
+  undefined reportForServiceWorkerScope(DOMString scope, DOMString message,
+                                        DOMString filename, unsigned long lineNumber,
+                                        unsigned long columnNumber,
+                                        ConsoleLevel level);
+};