1 files changed, 36 insertions, 0 deletions
diff --git a/testing/web-platform/tests/2dcontext/compositing/2d.composite.globalAlpha.range.html b/testing/web-platform/tests/2dcontext/compositing/2d.composite.globalAlpha.range.html
new file mode 100644
index 000000000..14926e6eb
--- /dev/null
+++ b/testing/web-platform/tests/2dcontext/compositing/2d.composite.globalAlpha.range.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by tools/gentest.py. -->
+<title>Canvas test: 2d.composite.globalAlpha.range</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/canvas-tests.js"></script>
+<link rel="stylesheet" href="/common/canvas-tests.css">
+<body class="show_output">
+
+<h1>2d.composite.globalAlpha.range</h1>
+<p class="desc"></p>
+
+
+<p class="output">Actual output:</p>
+<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
+
+<ul id="d"></ul>
+<script>
+var t = async_test("");
+_addTest(function(canvas, ctx) {
+
+ctx.globalAlpha = 0.5;
+var a = ctx.globalAlpha; // might not be exactly 0.5, if it is rounded/quantised, so remember for future comparisons
+ctx.globalAlpha = 1.1;
+_assertSame(ctx.globalAlpha, a, "ctx.globalAlpha", "a");
+ctx.globalAlpha = -0.1;
+_assertSame(ctx.globalAlpha, a, "ctx.globalAlpha", "a");
+ctx.globalAlpha = 0;
+_assertSame(ctx.globalAlpha, 0, "ctx.globalAlpha", "0");
+ctx.globalAlpha = 1;
+_assertSame(ctx.globalAlpha, 1, "ctx.globalAlpha", "1");
+
+
+});
+</script>
+