test_ua_rule_modification.html

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<!DOCTYPE html>

<title>Test for bug 1539159</title>

<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>

<link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>

<p></p>

<script>

function start() {

  let rules = InspectorUtils.getMatchingCSSRules(document.querySelector("p"));

  ok(rules.length > 0, "Should have found some rules");

  is(rules[0].type, CSSRule.STYLE_RULE, "Should have found a style rule");

  let selector = rules[0].selectorText;

  isnot(selector, ".xxxxx", "Rule selector should not be something strange");

  try {

    rules[0].selectorText = "img";

  } catch (ex) {

  is(rules[0].selectorText, selector, "Selector text should be unchanged");

  SimpleTest.finish();

SimpleTest.waitForExplicitFinish();

document.addEventListener('DOMContentLoaded', start)

</script>