test_set_attributes.html

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<!DOCTYPE HTML>

<html>

<head>

  <meta charset="utf-8">

  <title>Test L10n Mutations for AttributeChange after DOMContentLoaded</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">

  <link rel="localization" href="crashreporter/aboutcrashes.ftl"/>

  <link rel="localization" href="toolkit/about/aboutCompat.ftl"/>

  <script type="application/javascript">

  "use strict";

  SimpleTest.waitForExplicitFinish();

  document.addEventListener("DOMContentLoaded", async function() {

    await document.l10n.ready;

    let elem = document.getElementById("elem1");

    let elem2 = document.getElementById("elem2");

    is(elem.textContent.length, 0);

    is(elem2.textContent.includes("Initial string"), true);

    document.l10n.setAttributes(elem, "crash-reports-title");

    elem2.setAttribute("data-l10n-args", JSON.stringify({bug: "New string"}));

    let verifyL10n = () => {

      if (elem.textContent.length && elem2.textContent.includes("New string")) {

        window.removeEventListener("MozAfterPaint", verifyL10n);

        SimpleTest.finish();

};

    window.addEventListener("MozAfterPaint", verifyL10n);

});

  </script>

</head>

<body>

  <div id="elem1"></div>

  <div id="elem2" data-l10n-id="label-more-information" data-l10n-args='{"bug":"Initial string"}'></div>

</body>

</html>