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variable-substitution-filters.html
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<!DOCTYPE html>
<html>
<head>
<title>test filter function variable substitution</title>
<meta rel="author" title="Kevin Babbitt">
<meta rel="author" title="Greg Whitworth">
<link rel="author" title="Microsoft Corporation" href="http://microsoft.com" />
<link rel="help" href="http://www.w3.org/TR/css-variables-1/#defining-variables">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
.testArea {
width: 250px;
height: 167px;
display: inline-block;
background-image: url("../../../../images/a.jpg");
background-size: contain;
}
</style>
</head>
<body>
<div id="log"></div>
<div class="testArea" id="blur" style="--blur: 15px; filter: blur(var(--blur));"></div>
<div class="testArea" id="brightness" style="--foo: 0.5; filter: brightness(var(--foo));"></div>
<div class="testArea" id="contrast" style="--foo: 2; filter: contrast(var(--foo));"></div>
<div class="testArea" id="grayscale" style="--foo: 1; filter: grayscale(var(--foo));"></div>
<div class="testArea" id="invert" style="--foo: 1; filter: invert(var(--foo));"></div>
<div class="testArea" id="sepia" style="--foo: 1; filter: sepia(var(--foo));"></div>
<div class="testArea" id="saturate" style="--foo: 8; filter: saturate(var(--foo));"></div>
<script type="text/javascript">
"use strict";
let templates = [
{
testName:"blur",
expectedValue:"blur(15px)",
},
{
testName:"brightness",
expectedValue:"brightness(0.5)",
},
{
testName:"contrast",
expectedValue:"contrast(2)",
},
{
testName:"grayscale",
expectedValue:"grayscale(1)",
},
{
testName:"invert",
expectedValue:"invert(1)",
},
{
testName:"sepia",
expectedValue:"sepia(1)",
},
{
testName:"saturate",
expectedValue:"saturate(8)",
},
];
templates.forEach(function (template) {
test( function () {
let target = document.getElementById(template.testName);
let computedStyle = window.getComputedStyle(target);
let value = computedStyle.getPropertyValue("filter");
assert_equals(value, template.expectedValue, "Expected Value should match actual value");
}, template.testName);
});
</script>
</body>
</html>