Bug 951793 - Add a test for the pref that controls overscroll-behavior. r=emilio

MozReview-Commit-ID: 9qIuF1Vdsm4
2017-11-20 18:11:24 -05:00 · 2017-11-20 18:11:24 -05:00 · 94aad98f21
--- a/layout/style/test/mochitest.ini
+++ b/layout/style/test/mochitest.ini
@ -255,6 +255,7 @@ skip-if = android_version == '18' #debug-only failure; timed out #Android 4.3 aw
 [test_namespace_rule.html]
 [test_non_content_accessible_properties.html]
 [test_of_type_selectors.xhtml]
+[test_overscroll_behavior_pref.html]
 [test_page_parser.html]
 [test_parse_eof.html]
 [test_parse_ident.html]
--- a/layout/style/test/test_overscroll_behavior_pref.html
+++ b/layout/style/test/test_overscroll_behavior_pref.html
@ -0,0 +1,24 @@
+<!doctype html>
+<html>
+  <head>
+    <meta http-equiv="content-type" content="text/html; charset=utf-8">
+    <title>Test pref for overscroll-behavior property</title>
+    <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  </head>
+<script class="testbody" type="text/javascript">
+function runTest() {
+  let css = "div { overscroll-behavior: auto; }";
+  let style = document.createElement('style');
+  style.appendChild(document.createTextNode(css));
+  document.head.appendChild(style);
+
+  is(document.styleSheets[0].cssRules[0].style.length,
+     0,
+     "overscroll-behavior shouldn't be parsed if the pref is off");
+  SimpleTest.finish();
+}
+SpecialPowers.pushPrefEnv({ set: [["layout.css.overscroll-behavior.enabled", false]] },
+                          runTest);
+SimpleTest.waitForExplicitFinish();
+</script>
+</html>