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diff --git a/layout/style/test/test_first_line_restrictions.html b/layout/style/test/test_first_line_restrictions.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1382786
+-->
+<head>
+ <meta charset="utf-8">
+ <title>Test for Bug 1382786</title>
+ <script src="/tests/SimpleTest/SimpleTest.js"></script>
+ <script type="text/javascript" src="property_database.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+ <style id="s"></style>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1382786">Mozilla Bug 1382786</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<div id="test"></div>
+<div id="control"></div>
+<script type="application/javascript">
+
+/** Test for Bug 1382786 **/
+var test = getComputedStyle($("test"), "::first-line");
+var control = getComputedStyle($("control"), "::first-line");
+for (let prop in gCSSProperties) {
+ var info = gCSSProperties[prop];
+ if (info.type == CSS_TYPE_TRUE_SHORTHAND) {
+ // Can't get useful info out of getComputedStyle.
+ continue;
+ }
+ let prereqs = "";
+ if (info.prerequisites) {
+ for (let name in info.prerequisites) {
+ prereqs += `${name}: ${info.prerequisites[name]}; `;
+ }
+ }
+ $("s").textContent = `
+ #control::first-line { ${prop}: ${info.initial_values[0]}; ${prereqs} }
+ #test::first-line { ${prop}: ${info.other_values[0]}; ${prereqs} }
+ `;
+ if (info.applies_to_first_line) {
+ isnot(get_computed_value(test, prop),
+ get_computed_value(control, prop),
+ `${prop} should apply to ::first-line`);
+ } else {
+ is(get_computed_value(test, prop),
+ get_computed_value(control, prop),
+ `${prop} should not apply to ::first-line`);
+ }
+}
+
+</script>
+</body>
+</html>