Update interfaces/layout-instability.idl and test (#23651)
Closes https://github.com/web-platform-tests/wpt/pull/22499
diff --git a/interfaces/layout-instability.idl b/interfaces/layout-instability.idl
index 0cd2262..3ee0afa 100644
--- a/interfaces/layout-instability.idl
+++ b/interfaces/layout-instability.idl
@@ -5,8 +5,16 @@
[Exposed=Window]
interface LayoutShift : PerformanceEntry {
- readonly attribute long value;
+ readonly attribute double value;
readonly attribute boolean hadRecentInput;
readonly attribute DOMHighResTimeStamp lastInputTime;
+ readonly attribute FrozenArray<LayoutShiftAttribution> sources;
[Default] object toJSON();
};
+
+[Exposed=Window]
+interface LayoutShiftAttribution {
+ readonly attribute Node? node;
+ readonly attribute DOMRectReadOnly previousRect;
+ readonly attribute DOMRectReadOnly currentRect;
+};
diff --git a/layout-instability/idlharness.html b/layout-instability/idlharness.html
new file mode 100644
index 0000000..a3b2d1e
--- /dev/null
+++ b/layout-instability/idlharness.html
@@ -0,0 +1,45 @@
+<!doctype html>
+<title>Layout Instability IDL tests</title>
+<meta name="timeout" content="long">
+<link rel="help" href="https://wicg.github.io/layout-instability/">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/WebIDLParser.js"></script>
+<script src="/resources/idlharness.js"></script>
+<script>
+'use strict';
+
+idl_test(
+ ['layout-instability'],
+ ['performance-timeline', 'geometry', 'dom', 'hr-time'],
+ async (idl_array, t) => {
+ idl_array.add_objects({
+ LayoutShift: ['layoutShift'],
+ LayoutShiftAttribution: ['layoutShiftAttribution'],
+ });
+
+ // If LayoutShift isn't supported, avoid the timeout below and just let the
+ // objects declared above be null. The tests will still fail, but we will
+ // consistently generate the same set of subtests on all platforms.
+ if (!PerformanceObserver ||
+ !PerformanceObserver.supportedEntryTypes ||
+ !PerformanceObserver.supportedEntryTypes.includes('layout-shift')) {
+ return;
+ }
+
+ self.layoutShift = await new Promise((resolve, reject) => {
+ const observer = new PerformanceObserver(entryList => {
+ resolve(entryList.getEntries()[0]);
+ });
+ observer.observe({type: 'layout-shift', buffered: true});
+ t.step_timeout(() => reject('Timed out waiting for LayoutShift entry'), 3000);
+
+ // Move the image, to cause layout shift.
+ image.style.marginTop = '100px';
+ });
+ self.layoutShiftAttribution = layoutShift.sources[0];
+ }
+);
+</script>
+
+<img id="image" src="/images/green-100x50.png">
diff --git a/layout-instability/idlharness.window.js b/layout-instability/idlharness.window.js
deleted file mode 100644
index 7d97446..0000000
--- a/layout-instability/idlharness.window.js
+++ /dev/null
@@ -1,16 +0,0 @@
-// META: script=/resources/WebIDLParser.js
-// META: script=/resources/idlharness.js
-
-// https://wicg.github.io/layout-instability/
-
-'use strict';
-
-idl_test(
- ['layout-instability'],
- ['performance-timeline'],
- idl_array => {
- idl_array.add_objects({
- // LayoutShift: [ TODO ]
- });
- }
-);
