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<title>Test for computation of CSS 'revert' on all properties</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script src="property_database.js"></script>
<style id="stylesheet"></style>
<link rel="stylesheet" href="/tests/SimpleTest/test.css" />
<div id="inheritanceParent">
<div id="inherited"></div>
<div id="nonInherited"></div>
<div id="noAuthorStyleApplied"></div>
<pre id="test">
<script class="testbody">
const kSheet = document.getElementById("stylesheet").sheet;
const kAllDifferentFromInitialRule = kSheet.cssRules[kSheet.insertRule("#inheritanceParent {}", kSheet.cssRules.length)];
const kPrerequisites = kSheet.cssRules[kSheet.insertRule("#inherited, #inheritanceParent, #nonInherited, #noAuthorStyleApplied {}", kSheet.cssRules.length)];
const kResetPropRule = kSheet.cssRules[kSheet.insertRule("#nonInherited {}", kSheet.cssRules.length)];
const kInheritedDiv = document.getElementById("inherited");
const kResetDiv = document.getElementById("nonInherited");
const kNoAuthorStylesDiv = document.getElementById("noAuthorStyleApplied");
function computedValue(node, property) {
return get_computed_value(getComputedStyle(node), property);
function getInitialValue(node, property) {, "initial");
const initial = computedValue(node, property);;
return initial;
function testResetProperty(property, info) {, info.other_values[0]);
const div = kResetDiv;
const initial = getInitialValue(div, property);
const computed = computedValue(div, property);
isnot(computed, initial, `${property}: Should get something non-initial to begin with`);
const defaultValue = computedValue(kNoAuthorStylesDiv, property);, "revert");
const reverted = computedValue(div, property);
is(reverted, defaultValue, `${property}: Should behave as if there was no author style`);;;
function testInheritedProperty(property, info) {
// Given how line-height works, and that it always returns the used value, we
// cannot test it. The prerequisites for line-height makes getComputedStyle
// and getDefaultComputedStyle return the same, even though the computed value
// is different (normal vs. 19px).
if (property == "line-height")
const div = kInheritedDiv;
const initial = getInitialValue(div, property);
const parentValue = computedValue(div.parentNode, property);
isnot(parentValue, initial, `${property}: Should inherit something non-initial to begin with`);
const inheritedValue = computedValue(div, property);
const hasUARule = inheritedValue != parentValue;
const defaultValue = computedValue(kNoAuthorStylesDiv, property);
(hasUARule ? is : isnot)(defaultValue, inheritedValue, `${property}: Should get the non-inherited value from somewhere (expected ${hasUARule ? "UA Rule" : "inheritance"} - inherited: ${inheritedValue} - parent: ${parentValue} - default: ${defaultValue})`);, "revert");
const reverted = computedValue(div, property);
if (hasUARule)
is(reverted, defaultValue, `${property}: Should behave as if there was no author style`);
is(reverted, inheritedValue, `${property}: Should behave as if there was no author style`);;
function testProperty(property, info) {
if (info.prerequisites)
for (const prereq in info.prerequisites), info.prerequisites[prereq]);
if (info.inherited)
testInheritedProperty(property, info);
testResetProperty(property, info); = "";
for (const prop in gCSSProperties) {
const info = gCSSProperties[prop];
if (info.type != CSS_TYPE_LONGHAND)
continue;, info.other_values[0]);
for (const prop in gCSSProperties)
testProperty(prop, gCSSProperties[prop]);