dom/bindings/test/test_proxy_missing_prop.html

   1 <!DOCTYPE HTML>
   2 <html>
   3 <!--
   4 https://bugzilla.mozilla.org/show_bug.cgi?id=1863543
   5 -->
   6 <head>
   7   <meta charset="utf-8">
   8   <title>Test for Bug 1863543</title>
   9   <script src="/tests/SimpleTest/SimpleTest.js"></script>
  10   <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
  11 </head>
  12 <body>
  13 <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1863543">Mozilla Bug 1863543</a>
  14 <p id="display"></p>
  15 <pre id="test">
  16 <script>
  17 // Test for JIT IC guards for missing properties on the HTMLDocument DOM proxy.
  18 function testMissingProps() {
  19   var doc = document;
  20   var docProto = Object.getPrototypeOf(doc);
  21
  22   for (var i = 0; i < 30; i++) {
  23     if (i === 15) {
  24       // Add shadowing expando property.
  25       doc.unusedPropName1 = 12;
  26     }
  27     if (i === 20) {
  28       // Add prototype property.
  29       docProto.unusedPropName2 = 34;
  30     }
  31     if (i == 25) {
  32       // Add shadowing element.
  33       var el = document.createElement("object");
  34       el.id = "unusedPropName3";
  35       document.body.appendChild(el);
  36     }
  37     var v1 = doc.unusedPropName1;
  38     var v2 = doc.unusedPropName2;
  39     var v3 = doc.unusedPropName3;
  40     is(v1, i >= 15 ? 12 : undefined);
  41     is(v2, i >= 20 ? 34 : undefined);
  42     is(v3, i >= 25 ? el : undefined);
  43   }
  44 }
  45 testMissingProps();
  46 </script>
  47 </pre>
  48 </body>
  49 </html>