Bug 1880782 - Remove dom.animations-api.compositing.enabled and dom.animations-api.timelines.enabled prefs r=webidl,devtools-reviewers,firefox-animation-reviewers,nchevobbe,smaug,boris

Differential Revision: https://phabricator.services.mozilla.com/D211505
2024-06-05 19:13:23 +00:00 · 2024-06-05 19:13:23 +00:00 · 25e04b8c2a
--- a/browser/components/extensions/test/browser/browser.toml
+++ b/browser/components/extensions/test/browser/browser.toml
@ -4,8 +4,6 @@ prefs = [
  "browser.sessionstore.closedTabsFromAllWindows=true",
  "browser.sessionstore.closedTabsFromClosedWindows=true",
  "dom.ipc.keepProcessesAlive.extension=1", # We don't want to reset this at the end of the test, so that we don't have to spawn a new extension child process for each test unit.
-  "dom.animations-api.core.enabled=true",
-  "dom.animations-api.timelines.enabled=true",
  "javascript.options.asyncstack_capture_debuggee_only=false",
 ]
 support-files = [
--- a/browser/components/resistfingerprinting/test/browser/browser_animationapi_iframes.js
+++ b/browser/components/resistfingerprinting/test/browser/browser_animationapi_iframes.js
@ -204,7 +204,6 @@ extraPrefs = [
    "privacy.resistFingerprinting.reduceTimerPrecision.microseconds",
    extraData.RFP_Precision * 1000,
  ],
-  ["dom.animations-api.timelines.enabled", true],
 ];

 addAllTests(extraData, extraPrefs);
@ -219,7 +218,6 @@ extraPrefs = [
    "privacy.resistFingerprinting.reduceTimerPrecision.microseconds",
    extraData.RFP_Precision * 1000,
  ],
-  ["dom.animations-api.timelines.enabled", true],
 ];

 addAllTests(extraData, extraPrefs);
@ -231,5 +229,5 @@ extraData = {
  RFP_Precision: RFP_TIME_ATOM_MS,
  Unconditional_Precision: 0.02,
 };
-extraPrefs = [["dom.animations-api.timelines.enabled", true]];
+extraPrefs = [];
 addAllTests(extraData, extraPrefs);
--- a/browser/components/resistfingerprinting/test/mochitest/test_animation_api.html
+++ b/browser/components/resistfingerprinting/test/mochitest/test_animation_api.html
@ -39,7 +39,6 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=1382545
    prefName += reduceTimerPrecision ? "privacy.reduceTimerPrecision " : "";
    SpecialPowers.pushPrefEnv({"set":
      [
-        ["dom.animations-api.timelines.enabled", true],
        ["privacy.resistFingerprinting", resistFingerprinting],
        ["privacy.reduceTimerPrecision", reduceTimerPrecision],
        ["privacy.resistFingerprinting.reduceTimerPrecision.microseconds", expectedPrecision],
--- a/devtools/client/inspector/animation/test/head.js
+++ b/devtools/client/inspector/animation/test/head.js
@ -64,29 +64,6 @@ const closeAnimationInspector = async function () {
  return gDevTools.closeToolboxForTab(gBrowser.selectedTab);
 };

-/**
- * Some animation features are not enabled by default in release/beta channels
- * yet including parts of the Web Animations API.
- */
-const enableAnimationFeatures = function () {
-  return SpecialPowers.pushPrefEnv({
-    set: [["dom.animations-api.timelines.enabled", true]],
-  });
-};
-
-/**
- * Add a new test tab in the browser and load the given url.
- *
- * @param {String} url
- *        The url to be loaded in the new tab
- * @return a promise that resolves to the tab object when the url is loaded
- */
-const _addTab = addTab;
-addTab = async function (url) {
-  await enableAnimationFeatures();
-  return _addTab(url);
-};
-
 /**
 * Remove animated elements from document except given selectors.
 *
--- a/dom/animation/KeyframeEffect.cpp
+++ b/dom/animation/KeyframeEffect.cpp
@ -784,9 +784,6 @@ static KeyframeEffectParams KeyframeEffectParamsFromUnion(
  const KeyframeEffectOptions& options =
      KeyframeEffectOptionsFromUnion(aOptions);

-  // If dom.animations-api.compositing.enabled is turned off,
-  // iterationComposite and composite are the default value 'replace' in the
-  // dictionary.
  result.mIterationComposite = options.mIterationComposite;
  result.mComposite = options.mComposite;

@ -1272,8 +1269,6 @@ void KeyframeEffect::GetKeyframes(JSContext* aCx, nsTArray<JSObject*>& aResult,
      keyframe.mTimingFunction.ref().AppendToString(keyframeDict.mEasing);
    }  // else if null, leave easing as its default "linear".

-    // With the pref off (i.e. dom.animations-api.compositing.enabled:false),
-    // the dictionary-to-JS conversion will skip this member entirely.
    keyframeDict.mComposite = keyframe.mComposite;

    JS::Rooted<JS::Value> keyframeJSValue(aCx);
--- a/dom/animation/KeyframeUtils.cpp
+++ b/dom/animation/KeyframeUtils.cpp
@ -460,9 +460,7 @@ static bool ConvertKeyframeSequence(JSContext* aCx, dom::Document* aDocument,
      keyframe->mOffset.emplace(keyframeDict.mOffset.Value());
    }

-    if (StaticPrefs::dom_animations_api_compositing_enabled()) {
-      keyframe->mComposite = keyframeDict.mComposite;
-    }
+    keyframe->mComposite = keyframeDict.mComposite;

    // Look for additional property-values pairs on the object.
    nsTArray<PropertyValuesPair> propertyValuePairs;
@ -1155,26 +1153,23 @@ static void GetKeyframeListFromPropertyIndexedKeyframe(
  //
  // This corresponds to step 5, "Otherwise," branch, substep 12 of
  // https://drafts.csswg.org/web-animations/#processing-a-keyframes-argument
-  if (StaticPrefs::dom_animations_api_compositing_enabled()) {
-    const FallibleTArray<dom::CompositeOperationOrAuto>* compositeOps = nullptr;
-    AutoTArray<dom::CompositeOperationOrAuto, 1> singleCompositeOp;
-    auto& composite = keyframeDict.mComposite;
-    if (composite.IsCompositeOperationOrAuto()) {
-      singleCompositeOp.AppendElement(
-          composite.GetAsCompositeOperationOrAuto());
-      const FallibleTArray<dom::CompositeOperationOrAuto>& asFallibleArray =
-          singleCompositeOp;
-      compositeOps = &asFallibleArray;
-    } else if (composite.IsCompositeOperationOrAutoSequence()) {
-      compositeOps = &composite.GetAsCompositeOperationOrAutoSequence();
-    }
+  const FallibleTArray<dom::CompositeOperationOrAuto>* compositeOps = nullptr;
+  AutoTArray<dom::CompositeOperationOrAuto, 1> singleCompositeOp;
+  auto& composite = keyframeDict.mComposite;
+  if (composite.IsCompositeOperationOrAuto()) {
+    singleCompositeOp.AppendElement(composite.GetAsCompositeOperationOrAuto());
+    const FallibleTArray<dom::CompositeOperationOrAuto>& asFallibleArray =
+        singleCompositeOp;
+    compositeOps = &asFallibleArray;
+  } else if (composite.IsCompositeOperationOrAutoSequence()) {
+    compositeOps = &composite.GetAsCompositeOperationOrAutoSequence();
+  }

-    // Fill in and repeat as needed.
-    if (compositeOps && !compositeOps->IsEmpty()) {
-      size_t length = compositeOps->Length();
-      for (size_t i = 0; i < aResult.Length(); i++) {
-        aResult[i].mComposite = compositeOps->ElementAt(i % length);
-      }
+  // Fill in and repeat as needed.
+  if (compositeOps && !compositeOps->IsEmpty()) {
+    size_t length = compositeOps->Length();
+    for (size_t i = 0; i < aResult.Length(); i++) {
+      aResult[i].mComposite = compositeOps->ElementAt(i % length);
    }
  }
 }
--- a/dom/animation/test/chrome.toml
+++ b/dom/animation/test/chrome.toml
@ -1,6 +1,5 @@
 [DEFAULT]
 prefs = [
-  "dom.animations-api.compositing.enabled=true",
  "gfx.omta.background-color=true",
  "layout.css.basic-shape-rect.enabled=true",
  "layout.css.basic-shape-xywh.enabled=true",
--- a/dom/animation/test/chrome/test_animation_observers_sync.html
+++ b/dom/animation/test/chrome/test_animation_observers_sync.html
@ -1571,17 +1571,6 @@ function runTest() {
 }

 W3CTest.runner.expectAssertions(0, 12); // bug 1189015
-setup({explicit_done: true});
-SpecialPowers.pushPrefEnv(
-  {
-    set: [
-      ["dom.animations-api.timelines.enabled", true],
-    ],
-  },
-  function() {
-    runTest();
-    done();
-  }
-);
+runTest();

 </script>
--- a/dom/animation/test/crashtests/crashtests.list
+++ b/dom/animation/test/crashtests/crashtests.list
@ -1,39 +1,39 @@
 load 1134538.html
 load 1239889-1.html
 load 1244595-1.html
-pref(dom.animations-api.timelines.enabled,true) load 1216842-1.html
-pref(dom.animations-api.timelines.enabled,true) load 1216842-2.html
-pref(dom.animations-api.timelines.enabled,true) load 1216842-3.html
-pref(dom.animations-api.timelines.enabled,true) load 1216842-4.html
-pref(dom.animations-api.timelines.enabled,true) load 1216842-5.html
-pref(dom.animations-api.timelines.enabled,true) load 1216842-6.html
+load 1216842-1.html
+load 1216842-2.html
+load 1216842-3.html
+load 1216842-4.html
+load 1216842-5.html
+load 1216842-6.html
 load 1272475-1.html
 load 1272475-2.html
 load 1278485-1.html
-pref(dom.animations-api.timelines.enabled,true) load 1277272-1.html
+load 1277272-1.html
 load 1282691-1.html
 load 1291413-1.html
 load 1291413-2.html
-pref(dom.animations-api.compositing.enabled,true) load 1304886-1.html
+load 1304886-1.html
 load 1309198-1.html
 load 1322382-1.html
 load 1322291-1.html
 load 1322291-2.html
-pref(dom.animations-api.compositing.enabled,true) load 1323114-1.html
-pref(dom.animations-api.compositing.enabled,true) load 1323114-2.html
+load 1323114-1.html
+load 1323114-2.html
 load 1323119-1.html
 load 1324554-1.html
-pref(dom.animations-api.compositing.enabled,true) load 1325193-1.html
+load 1325193-1.html
 load 1332588-1.html
 load 1330190-1.html
-pref(dom.animations-api.compositing.enabled,true) load 1330190-2.html
-pref(dom.animations-api.compositing.enabled,true) load 1330513-1.html
-pref(dom.animations-api.timelines.enabled,true) load 1333539-1.html
-pref(dom.animations-api.timelines.enabled,true) load 1333539-2.html
+load 1330190-2.html
+load 1330513-1.html
+load 1333539-1.html
+load 1333539-2.html
 load 1334582-1.html
 load 1334582-2.html
 load 1334583-1.html
-pref(dom.animations-api.compositing.enabled,true) load 1335998-1.html
+load 1335998-1.html
 load 1343589-1.html
 load 1359658-1.html
 load 1373712-1.html
@ -41,7 +41,7 @@ load 1379606-1.html
 load 1393605-1.html
 load 1400022-1.html
 load 1401809.html
-pref(dom.animations-api.timelines.enabled,true) load 1411318-1.html
+load 1411318-1.html
 load 1468294-1.html
 load 1467277-1.html
 load 1524480-1.html
@ -57,6 +57,6 @@ load 1633486.html
 pref(layout.animation.prerender.partial,true) load 1656419.html
 load 1706157.html
 pref(gfx.omta.background-color,true) load 1699890.html
-pref(dom.animations-api.timelines.enabled,true) load 1714421.html
+load 1714421.html
 load 1807966.html
 load 1875441.html
--- a/dom/animation/test/mochitest.toml
+++ b/dom/animation/test/mochitest.toml
@ -1,7 +1,5 @@
 [DEFAULT]
 prefs = [
-  "dom.animations-api.compositing.enabled=true",
-  "dom.animations-api.timelines.enabled=true",
  "gfx.omta.background-color=true",
  "layout.css.scroll-driven-animations.enabled=true",
  "gfx.font_loader.delay=0",
@ -12,8 +10,6 @@ support-files = [
  "chrome/file_animate_xrays.html",
  "mozilla/xhr_doc.html",
  "mozilla/file_deferred_start.html",
-  "mozilla/file_disable_animations_api_compositing.html",
-  "mozilla/file_disable_animations_api_timelines.html",
  "mozilla/file_discrete_animations.html",
  "mozilla/file_transition_finish_on_compositor.html",
  "../../../layout/style/test/property_database.js",
@ -32,10 +28,6 @@ support-files = [
 ["mozilla/test_deferred_start.html"]
 skip-if = ["os == 'win' && bits == 64"] # Bug 1363957

-["mozilla/test_disable_animations_api_compositing.html"]
-
-["mozilla/test_disable_animations_api_timelines.html"]
-
 ["mozilla/test_disabled_properties.html"]

 ["mozilla/test_discrete_animations.html"]
--- a/dom/animation/test/mozilla/file_disable_animations_api_compositing.html
+++ b/dom/animation/test/mozilla/file_disable_animations_api_compositing.html
@ -1,137 +0,0 @@
-<!doctype html>
-<meta charset=utf-8>
-<script src="../testcommon.js"></script>
-<body>
-<script>
-'use strict';
-
-test(t => {
-  const anim = addDiv(t).animate(
-    { marginLeft: ['0px', '10px'] },
-    {
-      duration: 100 * MS_PER_SEC,
-      iterations: 10,
-      iterationComposite: 'accumulate',
-      composite: 'add',
-    }
-  );
-  assert_false(
-    'iterationComposite' in anim.effect,
-    'The KeyframeEffect.iterationComposite member is not present'
-  );
-  assert_false(
-    'composite' in anim.effect,
-    'The KeyframeEffect.composite member is not present'
-  );
-}, 'The iterationComposite and composite members are not present on Animation'
-   + ' when the compositing pref is disabled');
-
-test(t => {
-  const div = addDiv(t);
-  const anim = div.animate(
-    { marginLeft: ['0px', '10px'] },
-    {
-      duration: 100 * MS_PER_SEC,
-      iterations: 10,
-      iterationComposite: 'accumulate',
-    }
-  );
-  anim.pause();
-  anim.currentTime = 200 * MS_PER_SEC;
-
-  assert_equals(
-    getComputedStyle(div).marginLeft,
-    '0px',
-    'Animated style should NOT accumulate'
-  );
-}, 'KeyframeEffectOptions.iterationComposite should be ignored if the'
-   + ' compositing pref is disabled');
-
-test(t => {
-  const div = addDiv(t);
-  const anim1 = div.animate(
-    { marginLeft: ['0px', '100px'] },
-    { duration: 100 * MS_PER_SEC }
-  );
-  anim1.pause();
-  anim1.currentTime = 50 * MS_PER_SEC;
-
-  const anim2 = div.animate(
-    { marginLeft: ['0px', '100px'] },
-    { duration: 100 * MS_PER_SEC, composite: 'add' }
-  );
-  anim2.pause();
-  anim2.currentTime = 50 * MS_PER_SEC;
-
-  assert_equals(
-    getComputedStyle(div).marginLeft,
-    '50px',
-    'Animations should NOT add together'
-  );
-}, 'KeyframeEffectOptions.composite should be ignored if the'
-   + ' compositing pref is disabled');
-
-test(t => {
-  const div = addDiv(t);
-  const anim1 = div.animate({ marginLeft: ['0px', '100px'] }, 100 * MS_PER_SEC);
-  anim1.pause();
-  anim1.currentTime = 50 * MS_PER_SEC;
-
-  const anim2 = div.animate(
-    [
-      { marginLeft: '0px', composite: 'add' },
-      { marginLeft: '100px', composite: 'add' },
-    ],
-    100 * MS_PER_SEC
-  );
-  anim2.pause();
-  anim2.currentTime = 50 * MS_PER_SEC;
-
-  assert_equals(
-    getComputedStyle(div).marginLeft,
-    '50px',
-    'Animations should NOT add together'
-  );
-}, 'composite member is ignored on keyframes when using array notation');
-
-test(t => {
-  const div = addDiv(t);
-  const anim1 = div.animate(
-    { marginLeft: ['0px', '100px'] },
-    100 * MS_PER_SEC
-  );
-  anim1.pause();
-  anim1.currentTime = 50 * MS_PER_SEC;
-
-  const anim2 = div.animate(
-    { marginLeft: ['0px', '100px'], composite: ['add', 'add'] },
-    100 * MS_PER_SEC
-  );
-  anim2.pause();
-  anim2.currentTime = 50 * MS_PER_SEC;
-
-  assert_equals(
-    getComputedStyle(div).marginLeft,
-    '50px',
-    'Animations should NOT add together'
-  );
-}, 'composite member is ignored on keyframes when using object notation');
-
-test(t => {
-  const anim = addDiv(t).animate(
-    { marginLeft: ['0px', '10px'] },
-    100 * MS_PER_SEC
-  );
-
-  for (let frame of anim.effect.getKeyframes()) {
-    assert_false(
-      'composite' in frame,
-      'The BaseComputedKeyframe.composite member is not present'
-    );
-  }
-}, 'composite member is hidden from the result of ' +
-   'KeyframeEffect::getKeyframes()');
-
-done();
-</script>
-</body>
--- a/dom/animation/test/mozilla/file_disable_animations_api_timelines.html
+++ b/dom/animation/test/mozilla/file_disable_animations_api_timelines.html
@ -1,30 +0,0 @@
-<!doctype html>
-<meta charset=utf-8>
-<script src="../testcommon.js"></script>
-<body>
-<script>
-'use strict';
-
-test(t => {
-  assert_false(
-    window.hasOwnProperty('DocumentTimeline'),
-    'DocumentTimeline should not be exposed on the global'
-  );
-  assert_false(
-    window.hasOwnProperty('AnimationTimeline'),
-    'AnimationTimeline should not be exposed on the global'
-  );
-  assert_false(
-    'timeline' in document,
-    'document should not have a timeline property'
-  );
-
-  const anim = addDiv(t).animate(null);
-  assert_false(
-    'timeline' in anim,
-    'Animation should not have a timeline property'
-  );
-}, 'Timeline-related interfaces and members are disabled');
-
-done();
-</script>
--- a/dom/animation/test/mozilla/test_deferred_start.html
+++ b/dom/animation/test/mozilla/test_deferred_start.html
@ -6,14 +6,5 @@
 <script>
 'use strict';
 setup({explicit_done: true});
-SpecialPowers.pushPrefEnv(
-  {
-    set: [
-      ["dom.animations-api.timelines.enabled", true],
-    ],
-  },
-  function() {
-    window.open("file_deferred_start.html");
-  }
-);
+window.open("file_deferred_start.html");
 </script>
--- a/dom/animation/test/mozilla/test_disable_animations_api_compositing.html
+++ b/dom/animation/test/mozilla/test_disable_animations_api_compositing.html
@ -1,14 +0,0 @@
-<!doctype html>
-<meta charset=utf-8>
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<div id="log"></div>
-<script>
-'use strict';
-setup({explicit_done: true});
-SpecialPowers.pushPrefEnv(
-  { "set": [["dom.animations-api.compositing.enabled", false]]},
-  function() {
-    window.open("file_disable_animations_api_compositing.html");
-  });
-</script>
--- a/dom/animation/test/mozilla/test_disable_animations_api_timelines.html
+++ b/dom/animation/test/mozilla/test_disable_animations_api_timelines.html
@ -1,16 +0,0 @@
-<!doctype html>
-<meta charset=utf-8>
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<div id="log"></div>
-<script>
-'use strict';
-
-setup({ explicit_done: true });
-SpecialPowers.pushPrefEnv(
-  { set: [['dom.animations-api.timelines.enabled', false]] },
-  function() {
-    window.open('file_disable_animations_api_timelines.html');
-  }
-);
-</script>
--- a/dom/base/Document.cpp
+++ b/dom/base/Document.cpp
@ -4475,15 +4475,6 @@ bool Document::AllowsL10n() const {
  return allowed;
 }

-bool Document::AreWebAnimationsTimelinesEnabled(JSContext* aCx,
-                                                JSObject* /*unused*/
-) {
-  MOZ_ASSERT(NS_IsMainThread());
-
-  return nsContentUtils::IsSystemCaller(aCx) ||
-         StaticPrefs::dom_animations_api_timelines_enabled();
-}
-
 DocumentTimeline* Document::Timeline() {
  if (!mDocumentTimeline) {
    mDocumentTimeline = new DocumentTimeline(this, TimeDuration(0));
--- a/dom/base/Document.h
+++ b/dom/base/Document.h
@ -3417,8 +3417,6 @@ class Document : public nsINode,
  mozilla::dom::HTMLAllCollection* All();

  static bool DocumentSupportsL10n(JSContext* aCx, JSObject* aObject);
-  static bool AreWebAnimationsTimelinesEnabled(JSContext* aCx,
-                                               JSObject* aObject);
  // Checks that the caller is either chrome or some addon.
  static bool IsCallerChromeOrAddon(JSContext* aCx, JSObject* aObject);

--- a/dom/base/test/test_domwindowutils.html
+++ b/dom/base/test/test_domwindowutils.html
@ -81,7 +81,6 @@ function test_getUnanimatedComputedStyle() {
  SpecialPowers.pushPrefEnv(
    {
      set: [
-        ["dom.animations-api.timelines.enabled", true],
        ["layout.css.properties-and-values.enabled", true],
      ],
    },
--- a/dom/bindings/test/TestCodeGen.webidl
+++ b/dom/bindings/test/TestCodeGen.webidl
@ -1528,7 +1528,7 @@ interface TestFuncConstructorForInterface {
  constructor();
 };

-[Exposed=Window, Func="Document::AreWebAnimationsTimelinesEnabled"]
+[Exposed=Window, Func="Document::IsCallerChromeOrAddon"]
 interface TestFuncConstructorForDifferentFuncInterface {
  // Since the constructor has a different Func attribute from the interface,
  // the generated constructor should still check for its conditional func.
--- a/dom/webidl/Animation.webidl
+++ b/dom/webidl/Animation.webidl
@ -24,8 +24,7 @@ interface Animation : EventTarget {
  [Pure]
  attribute AnimationEffect? effect;
  // Bug 1676794. Drop BinaryName once we support ScrollTimeline interface.
-  [Func="Document::AreWebAnimationsTimelinesEnabled",
-   BinaryName="timelineFromJS"]
+  [BinaryName="timelineFromJS"]
  attribute AnimationTimeline? timeline;

  [BinaryName="startTimeAsDouble"]
--- a/dom/webidl/AnimationTimeline.webidl
+++ b/dom/webidl/AnimationTimeline.webidl
@ -10,8 +10,7 @@
 * liability, trademark and document use rules apply.
 */

-[Func="Document::AreWebAnimationsTimelinesEnabled",
- Exposed=Window]
+[Exposed=Window]
 interface AnimationTimeline {
  [BinaryName="currentTimeAsDouble"]
  readonly attribute double? currentTime;
--- a/dom/webidl/BaseKeyframeTypes.webidl
+++ b/dom/webidl/BaseKeyframeTypes.webidl
@ -39,7 +39,6 @@ dictionary BasePropertyIndexedKeyframe {
 dictionary BaseKeyframe {
  double? offset = null;
  UTF8String easing = "linear";
-  [Pref="dom.animations-api.compositing.enabled"]
  CompositeOperationOrAuto composite = "auto";

  // Non-standard extensions
--- a/dom/webidl/Document.webidl
+++ b/dom/webidl/Document.webidl
@ -388,7 +388,6 @@ partial interface Document {

 // https://drafts.csswg.org/web-animations/#extensions-to-the-document-interface
 partial interface Document {
-  [Func="Document::AreWebAnimationsTimelinesEnabled"]
  readonly attribute DocumentTimeline timeline;
 };

--- a/dom/webidl/DocumentTimeline.webidl
+++ b/dom/webidl/DocumentTimeline.webidl
@ -14,8 +14,7 @@ dictionary DocumentTimelineOptions {
  DOMHighResTimeStamp originTime = 0;
 };

-[Func="Document::AreWebAnimationsTimelinesEnabled",
- Exposed=Window]
+[Exposed=Window]
 interface DocumentTimeline : AnimationTimeline {
  [Throws]
  constructor(optional DocumentTimelineOptions options = {});
--- a/dom/webidl/KeyframeEffect.webidl
+++ b/dom/webidl/KeyframeEffect.webidl
@ -16,9 +16,7 @@ enum IterationCompositeOperation {
 };

 dictionary KeyframeEffectOptions : EffectTiming {
-  [Pref="dom.animations-api.compositing.enabled"]
  IterationCompositeOperation iterationComposite = "replace";
-  [Pref="dom.animations-api.compositing.enabled"]
  CompositeOperation          composite = "replace";
  DOMString?                  pseudoElement = null;
 };
@ -36,9 +34,7 @@ interface KeyframeEffect : AnimationEffect {

  attribute Element?                  target;
  [SetterThrows] attribute DOMString? pseudoElement;
-  [Pref="dom.animations-api.compositing.enabled"]
  attribute IterationCompositeOperation     iterationComposite;
-  [Pref="dom.animations-api.compositing.enabled"]
  attribute CompositeOperation              composite;
  [Throws] sequence<object> getKeyframes();
  [Throws] undefined        setKeyframes(object? keyframes);
--- a/dom/xslt/tests/mochitest/test_bug1135764.html
+++ b/dom/xslt/tests/mochitest/test_bug1135764.html
@ -26,21 +26,12 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=1135764
    SimpleTest.finish();
  }
  addLoadEvent(function() {
-    SpecialPowers.pushPrefEnv(
-      {
-        set: [
-          ["dom.animations-api.timelines.enabled", true],
-        ],
-      },
-      function() {
-        var ifr = document.querySelector("iframe");
-        ifr.onload = function() {
-          startTimelineValue = frames[0].document.timeline.currentTime;
-          frames[0].requestAnimationFrame(waitATick);
-        };
-        ifr.src = "file_bug1135764.xml";
-      }
-    );
+    var ifr = document.querySelector("iframe");
+    ifr.onload = function() {
+      startTimelineValue = frames[0].document.timeline.currentTime;
+      frames[0].requestAnimationFrame(waitATick);
+    };
+    ifr.src = "file_bug1135764.xml";
  });
  </script>
 </head>
--- a/gfx/layers/apz/test/mochitest/browser_test_group_fission.js
+++ b/gfx/layers/apz/test/mochitest/browser_test_group_fission.js
@ -4,7 +4,6 @@ add_task(async function setup_pref() {
      // To avoid throttling requestAnimationFrame callbacks in invisible
      // iframes
      ["layout.throttled_frame_rate", 60],
-      ["dom.animations-api.timelines.enabled", true],
      // Next two prefs are needed for hit-testing to work
      ["test.events.async.enabled", true],
      ["apz.test.logging_enabled", true],
--- a/layout/reftests/web-animations/reftest.list
+++ b/layout/reftests/web-animations/reftest.list
@ -19,8 +19,8 @@
 == stacking-context-transform-changing-effect-on-table.html stacking-context-animation-on-table-ref.html
 == stacking-context-transform-changing-display-property.html stacking-context-animation-ref.html
 == stacking-context-transform-losing-css-animation-in-delay.html stacking-context-animation-ref.html
-test-pref(dom.animations-api.compositing.enabled,true) == style-updates-on-iteration-composition-changed-from-accumulate-to-replace.html style-updates-for-iteration-composite-ref.html
-test-pref(dom.animations-api.compositing.enabled,true) == style-updates-on-iteration-composition-changed-from-replace-to-accumulate.html style-updates-for-iteration-composite-ref.html
-test-pref(dom.animations-api.compositing.enabled,true) == style-updates-on-current-iteration-changed.html style-updates-for-iteration-composite-ref.html
+== style-updates-on-iteration-composition-changed-from-accumulate-to-replace.html style-updates-for-iteration-composite-ref.html
+== style-updates-on-iteration-composition-changed-from-replace-to-accumulate.html style-updates-for-iteration-composite-ref.html
+== style-updates-on-current-iteration-changed.html style-updates-for-iteration-composite-ref.html
 == cancel-animation-with-selector-matching.html about:blank
 == child-in-animating-element-display-none.html child-in-animating-element-display-none-ref.html
--- a/layout/style/crashtests/crashtests.list
+++ b/layout/style/crashtests/crashtests.list
@ -193,7 +193,7 @@ load 1381420-1.html
 load 1381682.html
 load 1382672.html
 load 1382710.html
-pref(dom.animations-api.compositing.enabled,true) load 1383493-1.html
+load 1383493-1.html
 load 1383001.html
 load 1383001-2.html
 load 1383319.html
@ -225,7 +225,7 @@ load 1393791.html
 load 1384232.html
 load 1395725.html
 load 1396041.html
-pref(dom.animations-api.compositing.enabled,true) load 1397363-1.html
+load 1397363-1.html
 load 1395719.html
 load 1397091.html
 load 1398479.html
@ -317,4 +317,4 @@ load 1639533.html
 pref(layout.accessiblecaret.enabled,true) load 1640040.html
 load 1806189-1.html
 pref(layout.css.scroll-driven-animations.enabled,true) load 1821416.html
-pref(dom.animations-api.compositing.enabled,true) load 1872309.html
+load 1872309.html
--- a/layout/style/test/mochitest.toml
+++ b/layout/style/test/mochitest.toml
@ -1,7 +1,5 @@
 [DEFAULT]
 prefs = [
-  "dom.animations-api.compositing.enabled=true",
-  "dom.animations-api.timelines.enabled=true",
  "gfx.omta.background-color=true",
  "gfx.font_loader.delay=0",
  "layout.css.motion-path-url.enabled=true",
--- a/modules/libpref/init/StaticPrefList.yaml
+++ b/modules/libpref/init/StaticPrefList.yaml
@ -2226,18 +2226,6 @@
  value: true
  mirror: always

-# Is support for composite operations from the Web Animations API enabled?
- name: dom.animations-api.compositing.enabled
-  type: bool
-  value: true
-  mirror: always
-
-# Is support for timelines from the Web Animations API enabled?
- name: dom.animations-api.timelines.enabled
-  type: bool
-  value: true
-  mirror: always
-
 # Is support for Navigator.getBattery enabled?
 - name: dom.battery.enabled
  type: bool
--- a/testing/web-platform/meta/css/dir.ini
+++ b/testing/web-platform/meta/css/dir.ini
@ -1 +1 @@
-prefs: [dom.animations-api.compositing.enabled:true, layout.css.transition-behavior.enabled:true]
+prefs: [layout.css.transition-behavior.enabled:true]
--- a/testing/web-platform/meta/css/css-animations/dir.ini
+++ b/testing/web-platform/meta/css/css-animations/dir.ini
@ -1 +1 @@
-prefs: [dom.animations-api.compositing.enabled:true, dom.animations-api.timelines.enabled:true, layout.css.marker.restricted:false, layout.css.animation-composition.enabled:true, layout.css.properties-and-values.enabled:true]
+prefs: [layout.css.marker.restricted:false, layout.css.animation-composition.enabled:true, layout.css.properties-and-values.enabled:true]
--- a/testing/web-platform/meta/css/css-transforms/dir.ini
+++ b/testing/web-platform/meta/css/css-transforms/dir.ini
@ -1,2 +1,2 @@
-prefs: [dom.animations-api.compositing.enabled:true, layout.css.backdrop-filter.enabled:true, layout.css.transform-box-content-stroke.enabled:true]
+prefs: [layout.css.backdrop-filter.enabled:true, layout.css.transform-box-content-stroke.enabled:true]
 leak-threshold: [default:51200]
--- a/testing/web-platform/meta/css/css-transitions/dir.ini
+++ b/testing/web-platform/meta/css/css-transitions/dir.ini
@ -1 +1 @@
-prefs: [dom.animations-api.compositing.enabled:true, dom.animations-api.timelines.enabled:true, layout.css.marker.restricted:false, layout.css.starting-style-at-rules.enabled:true]
+prefs: [layout.css.marker.restricted:false, layout.css.starting-style-at-rules.enabled:true]
--- a/testing/web-platform/meta/web-animations/dir.ini
+++ b/testing/web-platform/meta/web-animations/dir.ini
@ -1 +1 @@
-prefs: [dom.animations-api.compositing.enabled:true, dom.animations-api.timelines.enabled:true, layout.css.marker.restricted:false, layout.css.properties-and-values.enabled:true]
+prefs: [layout.css.marker.restricted:false, layout.css.properties-and-values.enabled:true]