test_proxy_missing_prop.html

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https://bugzilla.mozilla.org/show_bug.cgi?id=1863543

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  <title>Test for Bug 1863543</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1863543">Mozilla Bug 1863543</a>

<p id="display"></p>

<pre id="test">

<script>

// Test for JIT IC guards for missing properties on the HTMLDocument DOM proxy.

function testMissingProps() {

  var doc = document;

  var docProto = Object.getPrototypeOf(doc);

  for (var i = 0; i < 30; i++) {

    if (i === 15) {

      // Add shadowing expando property.

      doc.unusedPropName1 = 12;

    if (i === 20) {

      // Add prototype property.

      docProto.unusedPropName2 = 34;

    if (i == 25) {

      // Add shadowing element.

      var el = document.createElement("object");

      el.id = "unusedPropName3";

      document.body.appendChild(el);

    var v1 = doc.unusedPropName1;

    var v2 = doc.unusedPropName2;

    var v3 = doc.unusedPropName3;

    is(v1, i >= 15 ? 12 : undefined);

    is(v2, i >= 20 ? 34 : undefined);

    is(v3, i >= 25 ? el : undefined);

testMissingProps();

</script>

</pre>

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