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Test Info:

<!DOCTYPE HTML>
<html>
<!--
-->
<head>
<title>Test for Bug 1350780</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
<style>
#container {
width: 100px;
}
.gridBefore::before {
content: "";
display: grid;
grid-template-columns: auto;
}
.gridBeforeNoContent::before {
display: grid;
grid-template-columns: 40px;
}
</style>
<script type="application/javascript">
SimpleTest.waitForExplicitFinish();
function checkTemplateWithData(data) {
let obj = document.createElement("div");
// We need either a template or an additionalClass.
if (typeof(data.template != "undefined")) {
obj.style.display = "grid";
obj.style.gridTemplateColumns = data.template;
}
if (typeof(data.additionalClass != "undefined")) {
obj.className = data.additionalClass;
}
let container = document.getElementById("container");
container.appendChild(obj);
let computedStyle = getComputedStyle(obj, data.pseudo);
let computedTemplate = computedStyle.getPropertyValue("grid-template-columns");
let message = "Got expected template with pseudo " + data.pseudo;
if (typeof(data.additionalClass != "undefined")) {
message += " with class " + data.additionalClass;
}
message += ".";
is(computedTemplate, data.expected, message);
container.removeChild(obj);
}
function runTest() {
let dataToTest = [
{ template: "40px",
pseudo: "::selection",
expected: "none"},
{ template: "40px",
pseudo: "::before",
expected: "none" },
{ additionalClass: "gridBefore",
pseudo: "::before",
expected: "100px" },
{ additionalClass: "gridBeforeNoContent",
pseudo: "::before",
expected: "40px" },
];
for (let i = 0; i < dataToTest.length; ++i) {
checkTemplateWithData(dataToTest[i]);
}
SimpleTest.finish();
}
</script>
</head>
<body onload="runTest()">
<div id="container"></div>
</body>
</html>