Bug 1842984 Remove dom.image-lazy-loading.enabled r=emilio

Differential Revision: https://phabricator.services.mozilla.com/D184883

dom/html/HTMLImageElement.cpp

@@ -1296,10 +1296,6 @@ void HTMLImageElement::SetLazyLoading() {
     return;
   }
 
-  if (!StaticPrefs::dom_image_lazy_loading_enabled()) {
-    return;
-  }
-
   // If scripting is disabled don't do lazy load.
   // https://whatpr.org/html/3752/images.html#updating-the-image-data
   //

dom/webidl/HTMLImageElement.webidl

@@ -41,7 +41,7 @@ interface HTMLImageElement : HTMLElement {
            attribute unsigned long height;
            [CEReactions, SetterThrows]
            attribute DOMString decoding;
-           [CEReactions, SetterThrows, Pref="dom.image-lazy-loading.enabled"]
+           [CEReactions, SetterThrows]
            attribute DOMString loading;
   readonly attribute unsigned long naturalWidth;
   readonly attribute unsigned long naturalHeight;

layout/generic/test/test_reframe_for_lazy_load_image.html

@@ -15,7 +15,6 @@ SpecialPowers.pushPrefEnv(
   // the `alt` change.
   {
     set: [
-      ["dom.image-lazy-loading.enabled", true],
       ["dom.image-lazy-loading.root-margin.top", 0],
       ["dom.image-lazy-loading.root-margin.bottom", 0],
       ["dom.image-lazy-loading.root-margin.left", 0],

layout/reftests/image/reftest.list

@@ -67,7 +67,7 @@ fails-if(useDrawSnapshot) == image-srcset-svg-default-2x.html image-srcset-svg-d
 == image-resize-percent-width.html image-resize-ref.html
 
 == moz-broken-matching-1.html moz-broken-matching-1-ref.html
-pref(dom.image-lazy-loading.enabled,true) == moz-broken-matching-lazy-load.html moz-broken-matching-1-ref.html
+== moz-broken-matching-lazy-load.html moz-broken-matching-1-ref.html
 
 == img-invalidation-local-transform-1.html img-invalidation-local-transform-1-ref.html
 == unknown-protocol.html unknown-protocol-ref.html

modules/libpref/init/StaticPrefList.yaml

@@ -2706,14 +2706,6 @@
   value: false
   mirror: always
 
-# <img loading="lazy">
-#
-# See https://github.com/whatwg/html/pull/3752
-- name: dom.image-lazy-loading.enabled
-  type: RelaxedAtomicBool
-  value: true
-  mirror: always
-
 # The root margin for image lazy loading, defined as four (value, percentage)
 # pairs.
 - name: dom.image-lazy-loading.root-margin.top

parser/html/nsHtml5TreeBuilderCppSupplement.h

@@ -183,8 +183,7 @@ nsIContentHandle* nsHtml5TreeBuilder::createElement(
         if (nsGkAtoms::img == aName) {
           nsHtml5String loading =
               aAttributes->getValue(nsHtml5AttributeName::ATTR_LOADING);
-          if (!mozilla::StaticPrefs::dom_image_lazy_loading_enabled() ||
-              !loading.LowerCaseEqualsASCII("lazy")) {
+          if (!loading.LowerCaseEqualsASCII("lazy")) {
             nsHtml5String url =
                 aAttributes->getValue(nsHtml5AttributeName::ATTR_SRC);
             nsHtml5String srcset =

testing/web-platform/meta/loading/lazyload/__dir__.ini

@@ -1 +0,0 @@
-prefs: [dom.image-lazy-loading.enabled:true]