Bug 1917034 - Remove some related always-on prefs. r=firefox-style-system-reviewers,zrhoffman

Differential Revision: https://phabricator.services.mozilla.com/D221769

browser/base/content/test/static/browser_parsable_css.js

@@ -76,24 +76,6 @@ if (!Services.prefs.getBoolPref("layout.css.scroll-anchoring.enabled")) {
   });
 }
 
-if (!Services.prefs.getBoolPref("layout.css.forced-colors.enabled")) {
-  ignoreList.push({
-    sourceName: /pdf\.js\/web\/viewer\.css$/,
-    errorMessage: /Expected media feature name but found ‘forced-colors’*/i,
-    isFromDevTools: false,
-  });
-}
-
-if (!Services.prefs.getBoolPref("layout.css.forced-color-adjust.enabled")) {
-  // PDF.js uses a property that is currently not enabled.
-  ignoreList.push({
-    sourceName: /web\/viewer\.css$/i,
-    errorMessage:
-      /Unknown property ‘forced-color-adjust’\. {2}Declaration dropped\./i,
-    isFromDevTools: false,
-  });
-}
-
 let propNameAllowlist = [
   // These custom properties are retrieved directly from CSSOM
   // in videocontrols.xml to get pre-defined style instead of computed

browser/components/reportbrokensite/test/browser/browser_prefers_contrast.js

@@ -9,15 +9,9 @@
 
 add_common_setup();
 
-const HIGH_CONTRAST_MODE_OFF = [
-  [PREFS.USE_ACCESSIBILITY_THEME, 0],
-  [PREFS.PREFERS_CONTRAST_ENABLED, true],
-];
+const HIGH_CONTRAST_MODE_OFF = [[PREFS.USE_ACCESSIBILITY_THEME, 0]];
 
-const HIGH_CONTRAST_MODE_ON = [
-  [PREFS.USE_ACCESSIBILITY_THEME, 1],
-  [PREFS.PREFERS_CONTRAST_ENABLED, true],
-];
+const HIGH_CONTRAST_MODE_ON = [[PREFS.USE_ACCESSIBILITY_THEME, 1]];
 
 add_task(async function testReportSentViewBGColor() {
   ensureReportBrokenSitePreffedOn();

browser/components/reportbrokensite/test/browser/head.js

@@ -31,7 +31,6 @@ const PREFS = {
   SEND_MORE_INFO: "ui.new-webcompat-reporter.send-more-info-link",
   NEW_REPORT_ENDPOINT: "ui.new-webcompat-reporter.new-report-endpoint",
   REPORT_SITE_ISSUE_ENABLED: "extensions.webcompat-reporter.enabled",
-  PREFERS_CONTRAST_ENABLED: "layout.css.prefers-contrast.enabled",
   TOUCH_EVENTS: "dom.w3c_touch_events.enabled",
   USE_ACCESSIBILITY_THEME: "ui.useAccessibilityTheme",
 };

layout/base/nsPresContext.cpp

@@ -572,9 +572,6 @@ void nsPresContext::PreferenceChanged(const char* aPrefName) {
   auto restyleHint = RestyleHint{0};
   // Changing any of these potentially changes the value of @media
   // (prefers-contrast).
-  // The layout.css.prefers-contrast.enabled pref itself is not handled here,
-  // because that pref doesn't just affect the "live" value of the media query;
-  // it affects whether it is parsed at all.
   if (prefName.EqualsLiteral("browser.display.document_color_use") ||
       prefName.EqualsLiteral("browser.display.foreground_color") ||
       prefName.EqualsLiteral("browser.display.background_color")) {

layout/reftests/high-contrast/reftest.list

@@ -1,5 +1,5 @@
 # This pref enables high-contrast mode in the testcases here:
-defaults test-pref(browser.display.document_color_use,2) test-pref(browser.display.permit_backplate,true) test-pref(layout.css.prefers-contrast.enabled,true) test-pref(layout.css.forced-colors.enabled,true) test-pref(browser.display.foreground_color,"#000000") test-pref(browser.display.background_color,"#FFFFFF") pref(ui.use_standins_for_native_colors,true) pref(widget.non-native-theme.always-high-contrast,true)
+defaults test-pref(browser.display.document_color_use,2) test-pref(browser.display.permit_backplate,true) test-pref(browser.display.foreground_color,"#000000") test-pref(browser.display.background_color,"#FFFFFF") pref(ui.use_standins_for_native_colors,true) pref(widget.non-native-theme.always-high-contrast,true)
 
 # There are several platform-specific fuzzy-if notations below due to
 # anti-aliasing, extra ink overflow, and slightly inacurate reftest
@@ -66,9 +66,6 @@ test-pref(privacy.resistFingerprinting,true) != prefers-contrast-001.html prefer
 # high should not match when RFP is enabled.
 test-pref(ui.windowForeground,"black") test-pref(ui.windowBackground,"white") test-pref(privacy.resistFingerprinting,true) test-pref(ui.useAccessibilityTheme,1) != prefers-contrast-002.html prefers-contrast-black-ref.html
 
-# Should only be enabled behind preference.
-test-pref(layout.css.prefers-contrast.enabled,false) != prefers-contrast-001.html prefers-contrast-black-ref.html
-
 # a prefers-contrast value of no-preference should evaluate to false
 # in the boolean context
 test-pref(browser.display.document_color_use,0) != prefers-contrast-001.html prefers-contrast-black-ref.html
@@ -105,7 +102,7 @@ pref(ui.use_standins_for_native_colors,false) pref(browser.display.use_system_co
 pref(ui.use_standins_for_native_colors,false) pref(browser.display.use_system_colors,false) pref(browser.display.background_color,"white") pref(browser.display.foreground_color,"black") == prefers-color-scheme.html prefers-color-scheme-light.html
 
 # Forced color adjust
-pref(layout.css.forced-color-adjust.enabled,true) == backplate-force-color-adjust.html backplate-force-color-adjust-ref.html
+== backplate-force-color-adjust.html backplate-force-color-adjust-ref.html
 == transparent-textarea.html transparent-textarea-ref.html
 
 == color-scheme.html color-scheme-ref.html

layout/style/test/chrome/test_chrome_only_media_queries.html

@@ -8,23 +8,6 @@ const SHEET = document.querySelector('style');
 
 SimpleTest.waitForExplicitFinish();
 
-async function testWithPref() {
-  await new Promise(r => {
-    SpecialPowers.pushPrefEnv(
-      {
-        set: [
-          ["layout.css.forced-colors.enabled", false],
-        ],
-      },
-      r
-    );
-  });
-  expectKnown("(forced-colors: none)");
-  expectKnown("(forced-colors: active)");
-  expectKnown("(forced-colors)");
-  SimpleTest.finish();
-}
-
 function expect(q, shouldBeKnown) {
   is(matchMedia(q).media, q, "Serialization should roundtrip");
   is(matchMedia(`${q} or (not ${q})`).matches, shouldBeKnown, `Query should${shouldBeKnown ? "" : " not"} be known`);
@@ -80,5 +63,5 @@ expectKnown("(forced-colors)");
 
 expectUnkown("(-moz-platform: )");
 
-testWithPref();
+SimpleTest.finish();
 </script>

layout/style/test/property_database.js

@@ -13830,16 +13830,14 @@ gCSSProperties["math-style"] = {
   invalid_values: [],
 };
 
-if (IsCSSPropertyPrefEnabled("layout.css.forced-color-adjust.enabled")) {
-  gCSSProperties["forced-color-adjust"] = {
+gCSSProperties["forced-color-adjust"] = {
   domProp: "forcedColorAdjust",
   inherited: true,
   type: CSS_TYPE_LONGHAND,
   initial_values: ["auto"],
   other_values: ["none"],
   invalid_values: [],
-  };
-}
+};
 
 if (IsCSSPropertyPrefEnabled("layout.css.animation-composition.enabled")) {
   gCSSProperties["animation-composition"] = {

layout/style/test/test_media_queries.html

@@ -710,25 +710,15 @@ function run() {
     expression_should_not_be_known(query);
   }
 
-  {
-    let should_be_parseable_if_enabled = SpecialPowers.getBoolPref('layout.css.prefers-contrast.enabled')
-      ? expression_should_be_known
-      : expression_should_not_be_known;
-    should_be_parseable_if_enabled("prefers-contrast");
-    should_be_parseable_if_enabled("prefers-contrast: more");
-    should_be_parseable_if_enabled("prefers-contrast: less");
-    should_be_parseable_if_enabled("prefers-contrast: custom");
-    should_be_parseable_if_enabled("prefers-contrast: no-preference");
-  }
+  expression_should_be_known("prefers-contrast");
+  expression_should_be_known("prefers-contrast: more");
+  expression_should_be_known("prefers-contrast: less");
+  expression_should_be_known("prefers-contrast: custom");
+  expression_should_be_known("prefers-contrast: no-preference");
 
-  {
-    let should_be_parseable_if_enabled = SpecialPowers.getBoolPref('layout.css.forced-colors.enabled')
-      ? expression_should_be_known
-      : expression_should_not_be_known;
-    should_be_parseable_if_enabled("forced-colors");
-    should_be_parseable_if_enabled("forced-colors: none");
-    should_be_parseable_if_enabled("forced-colors: active");
-  }
+  expression_should_be_known("forced-colors");
+  expression_should_be_known("forced-colors: none");
+  expression_should_be_known("forced-colors: active");
 
   // OpenType SVG media features
   expression_should_not_be_known("(-moz-is-glyph)");

layout/style/test/test_mq_prefers_contrast_dynamic.html

@@ -35,7 +35,6 @@ function promiseForChange(mediaQuery) {
 }
 
 add_task(async () => {
-  await SpecialPowers.pushPrefEnv({ set: [["layout.css.prefers-contrast.enabled", true]]});
   const initiallyMatches =
     window.matchMedia("(prefers-contrast: more)").matches;
   const changePromise = initiallyMatches ?

modules/libpref/init/StaticPrefList.yaml

@@ -9229,17 +9229,6 @@
   mirror: always
   rust: true
 
-# Dictates whether or not the prefers contrast media query will be
-# usable.
-#   true: prefers-contrast will toggle based on OS and browser settings.
-#   false: prefers-contrast will only parse and toggle in the browser
-#   chrome and ua.
-- name: layout.css.prefers-contrast.enabled
-  type: RelaxedAtomicBool
-  value: true
-  mirror: always
-  rust: true
-
 # An override for prefers-color-scheme for content documents.
 #   0: Dark
 #   1: Light
@@ -9249,13 +9238,6 @@
   value: 2
   mirror: always
 
-# Dictates whether or not the forced-colors media query is enabled.
-- name: layout.css.forced-colors.enabled
-  type: RelaxedAtomicBool
-  value: true
-  mirror: always
-  rust: true
-
 # Dictates whether or not the prefers-reduced-transparency media query is enabled.
 - name: layout.css.prefers-reduced-transparency.enabled
   type: RelaxedAtomicBool
@@ -9270,13 +9252,6 @@
   mirror: always
   rust: true
 
-# Is support for forced-color-adjust properties enabled?
-- name: layout.css.forced-color-adjust.enabled
-  type: RelaxedAtomicBool
-  value: true
-  mirror: always
-  rust: true
-
 # Is support for -moz-prefixed animation properties enabled?
 - name: layout.css.prefixes.animations
   type: bool

servo/components/style/gecko/media_features.rs

@@ -835,11 +835,6 @@ pub static MEDIA_FEATURES: [QueryFeatureDescription; 60] = [
         atom!("prefers-contrast"),
         AllowsRanges::No,
         keyword_evaluator!(eval_prefers_contrast, PrefersContrast),
-        // Note: by default this is only enabled in browser chrome and
-        // ua. It can be enabled on the web via the
-        // layout.css.prefers-contrast.enabled preference. See
-        // disabed_by_pref in media_feature_expression.rs for how that
-        // is done.
         FeatureFlags::empty(),
     ),
     feature!(

servo/components/style/properties/longhands/inherited_text.mako.rs

@@ -358,8 +358,6 @@ ${helpers.predefined_type(
     "ForcedColorAdjust",
     "computed::ForcedColorAdjust::Auto",
     engines="gecko",
-    gecko_pref="layout.css.forced-color-adjust.enabled",
-    has_effect_on_gecko_scrollbars=False,
     animation_type="discrete",
     spec="https://drafts.csswg.org/css-color-adjust-1/#forced-color-adjust-prop",
     affects="paint",

servo/components/style/queries/feature_expression.rs

@@ -309,20 +309,6 @@ fn consume_operation_or_colon<'i>(
 fn disabled_by_pref(feature: &Atom, context: &ParserContext) -> bool {
     #[cfg(feature = "gecko")]
     {
-        if *feature == atom!("forced-colors") {
-            // forced-colors is always enabled in the ua and chrome. On
-            // the web it is hidden behind a preference, which is defaulted
-            // to 'true' as of bug 1659511.
-            return !context.chrome_rules_enabled() &&
-                !static_prefs::pref!("layout.css.forced-colors.enabled");
-        }
-        // prefers-contrast is always enabled in the ua and chrome. On
-        // the web it is hidden behind a preference.
-        if *feature == atom!("prefers-contrast") {
-            return !context.chrome_rules_enabled() &&
-                !static_prefs::pref!("layout.css.prefers-contrast.enabled");
-        }
-
         // prefers-reduced-transparency is always enabled in the ua and chrome. On
         // the web it is hidden behind a preference (see Bug 1822176).
         if *feature == atom!("prefers-reduced-transparency") {
@@ -331,7 +317,7 @@ fn disabled_by_pref(feature: &Atom, context: &ParserContext) -> bool {
         }
 
         // inverted-colors is always enabled in the ua and chrome. On
-        // the web it is hidden behind a preferenc.
+        // the web it is hidden behind a preference.
         if *feature == atom!("inverted-colors") {
             return !context.chrome_rules_enabled() &&
                 !static_prefs::pref!("layout.css.inverted-colors.enabled");