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Test Info: Warnings
- This test has a WPT meta file that expects 4 subtest issues.
- This WPT test may be referenced by the following Test IDs:
- /html/canvas/element/manual/draw-element-image/onpaint-remove-non-drawable-element.tentative.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<title>canvas.onpaint should fire when a non-drawable child of a drawable element is removed from the DOM</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
canvas {
background: blue;
}
div, span {
width: 50px;
height: 50px;
background: green;
}
</style>
<canvas id="canvas" width="200" height="200" layoutsubtree>
<div id="drawable_parent" drawable>
<div id="nondrawable_child"></div>
</div>
<div id="drawable_parent_inline" drawable>
<span id="nondrawable_span">text</span>
</div>
<div id="drawable_mixed_parent" drawable>
<div id="drawable_sibling" drawable></div>
<div id="nondrawable_target"></div>
</div>
<div id="drawable_deep_root" drawable>
<div id="nondrawable_wrapper">
<div id="nondrawable_leaf"></div>
</div>
</div>
</canvas>
<script>
'use strict';
async function waitForOneFrame() {
await new Promise(requestAnimationFrame);
await new Promise(setTimeout);
}
promise_test(async t => {
await waitForOneFrame();
let onPaintCount = 0;
let lastChanged = [];
canvas.onpaint = (event) => {
onPaintCount++;
lastChanged = event.changedElements;
};
nondrawable_child.remove();
await waitForOneFrame();
assert_equals(onPaintCount, 1,
'onpaint should fire after a non-drawable child is removed.');
assert_array_equals(lastChanged, [drawable_parent],
'The parent drawable element should be reported in changedElements.');
await waitForOneFrame();
assert_equals(onPaintCount, 1,
'onpaint should not fire without additional changes.');
}, 'onpaint should fire when a non-drawable child of a drawable element is removed');
promise_test(async t => {
await waitForOneFrame();
let onPaintCount = 0;
let lastChanged = [];
canvas.onpaint = (event) => {
onPaintCount++;
lastChanged = event.changedElements;
};
nondrawable_span.remove();
await waitForOneFrame();
assert_equals(onPaintCount, 1,
'onpaint should fire after a non-drawable inline child is removed.');
assert_array_equals(lastChanged, [drawable_parent_inline],
'The parent drawable element should be reported in changedElements.');
await waitForOneFrame();
assert_equals(onPaintCount, 1,
'onpaint should not fire without additional changes.');
}, 'onpaint should fire when a non-drawable inline child of a drawable element is removed');
promise_test(async t => {
await waitForOneFrame();
let onPaintCount = 0;
let lastChanged = [];
canvas.onpaint = (event) => {
onPaintCount++;
lastChanged = event.changedElements;
};
nondrawable_target.remove();
await waitForOneFrame();
assert_equals(onPaintCount, 1,
'onpaint should fire after a non-drawable child is removed from a mixed container.');
assert_array_equals(lastChanged, [drawable_mixed_parent],
'The parent drawable element should be reported in changedElements.');
await waitForOneFrame();
assert_equals(onPaintCount, 1,
'onpaint should not fire without additional changes.');
}, 'onpaint should fire when a non-drawable child is removed from a drawable element with mixed children');
promise_test(async t => {
await waitForOneFrame();
let onPaintCount = 0;
let lastChanged = [];
canvas.onpaint = (event) => {
onPaintCount++;
lastChanged = event.changedElements;
};
nondrawable_leaf.remove();
await waitForOneFrame();
assert_equals(onPaintCount, 1,
'onpaint should fire after a deep non-drawable descendant is removed.');
assert_array_equals(lastChanged, [drawable_deep_root],
'The ancestor drawable element should be reported in changedElements.');
await waitForOneFrame();
assert_equals(onPaintCount, 1,
'onpaint should not fire without additional changes.');
}, 'onpaint should fire when a deep non-drawable descendant of a drawable element is removed');
</script>