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https://github.com/web-platform-tests/wpt
26 December 2018, 22:31:15 UTC
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Tip revision: e765504c37c15353fc699292c329d5fa20df82c7 authored by maxlg@chromium.org on 01 September 2017, 15:41:53 UTC
[PerformanceObserver] Support the "buffered" flag in PerformanceObserver
Tip revision: e765504
2d.state.saverestore.globalAlpha.html 
<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by tools/gentest.py. -->
<title>OffscreenCanvas test: 2d.state.saverestore.globalAlpha</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/canvas-tests.js"></script>

<h1>2d.state.saverestore.globalAlpha</h1>
<p class="desc">save()/restore() works for globalAlpha</p>


<script>
var t = async_test("save()/restore() works for globalAlpha");
t.step(function() {

var offscreenCanvas = new OffscreenCanvas(100, 50);
var ctx = offscreenCanvas.getContext('2d');

// Test that restore() undoes any modifications
var old = ctx.globalAlpha;
ctx.save();
ctx.globalAlpha = 0.5;
ctx.restore();
_assertSame(ctx.globalAlpha, old, "ctx.globalAlpha", "old");

// Also test that save() doesn't modify the values
ctx.globalAlpha = 0.5;
old = ctx.globalAlpha;
    // we're not interested in failures caused by get(set(x)) != x (e.g.
    // from rounding), so compare against 'old' instead of against 0.5
ctx.save();
_assertSame(ctx.globalAlpha, old, "ctx.globalAlpha", "old");
ctx.restore();

t.done();

});
</script>
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