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diff --git a/widget/tests/test_actionhint.html b/widget/tests/test_actionhint.html
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+<!DOCTYPE html>
+<html>
+<head>
+<title>Tests for action hint that is used by software keyboard</title>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script src="/tests/SimpleTest/SpecialPowers.js"></script>
+<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+<div>
+<form><input type="text" id="a1"><input type="text" id="a2"><input type="submit"></form>
+<form><input type="search" id="b1"><input type="submit"></form>
+<form><input type="text" id="c1"></form>
+<form><input type="text" id="d1"><textarea></textarea><input type="submit"></form>
+<form><input type="text" id="e1"><input type="number"><input type="submit"></form>
+<form><input type="text" id="f1"><input type="date"><input type="submit"></form>
+<form><input type="text" id="g1"><input type="radio"><input type="submit"></form>
+<form><input type="text" id="h1"><input type="text" readonly><input type="submit"></form>
+<form><input type="text" id="i1"><input type="text" disabled><input type="submit"></form>
+<input type="text" id="j1"><input type="text"><input type="button">
+<form><input type="text" id="k1"><a href="#foo">foo</a><input type="text"><input type="submit"></form>
+<form>
+  <input id="l1" enterkeyhint="enter">
+  <input id="l2" enterkeyhint="DONE">
+  <input id="l3" enterkeyhint="go">
+  <input id="l4" enterkeyhint="Next">
+  <input id="l5" enterkeyhint="Previous">
+  <input id="l6" enterkeyhint="search">
+  <textarea id="l7" enterkeyhint="send"></textarea>
+  <input id="l8" type="number" enterkeyhint="previous">
+  <input id="l9" type="date" enterkeyhint="done">
+  <input id="l10" type="time" enterkeyhint="done">
+  <input id="l11" enterkeyhint="NONE">
+</form>
+</div>
+<pre id="test">
+<script class="testbody" type="application/javascript">
+add_task(async function setup() {
+  await new Promise(r => SimpleTest.waitForFocus(r));
+});
+
+add_task(async function basic() {
+  const tests = [
+    { id: "a1", hint: "maybenext", desc: "next element is type=text" },
+    { id: "a2", hint: "go", desc: "next element is type=submit" },
+    { id: "b1", hint: "search", desc: "current is type=search" },
+    { id: "c1", hint: "go", desc: "only this element" },
+    { id: "d1", hint: "maybenext", desc: "next element is textarea" },
+    { id: "e1", hint: "maybenext", desc: "next element is type=number" },
+    { id: "h1", hint: "go", desc: "next element is readonly" },
+    // XXX Feel free to change this result if you get some bugs reports
+    { id: "i1", hint: "go", desc: "next element is disabled" },
+    { id: "j1", hint: "", desc: "no form element" },
+    { id: "l1", hint: "enter", desc: "enterkeyhint=enter" },
+    { id: "l2", hint: "done", desc: "enterkeyhint=DONE" },
+    { id: "l3", hint: "go", desc: "enterkeyhint=go" },
+    { id: "l4", hint: "next", desc: "enterkeyhint=Next" },
+    { id: "l5", hint: "previous", desc: "enterkeyhint=Previous" },
+    { id: "l6", hint: "search", desc: "enterkeyhint=search" },
+    { id: "l7", hint: "send", desc: "enterkeyhint=send" },
+    { id: "l8", hint: "previous", desc: "type=number enterkeyhint=previous" },
+    // type=date is readonly content
+    { id: "l9", hint: "", desc: "type=date enterkeyhint=done" },
+    // type=time is readonly content
+    { id: "l10", hint: "", desc: "type=time enterkeyhint=done" },
+    // Since enterkeyhint is invalid, we infer action hint. So feel free to change this.
+    { id: "l11", hint: "go", desc: "enterkeyhint is invalid" },
+  ];
+
+  const todo_tests = [
+    { id: "f1", hint: "maybenext", desc: "next element is type=date" },
+    { id: "k1", hint: "", desc: "next is anchor link" },
+  ];
+
+
+  for (let test of tests) {
+    document.getElementById(test.id).focus();
+    is(SpecialPowers.DOMWindowUtils.focusedActionHint, test.hint, test.desc);
+  }
+
+  for (let test of todo_tests) {
+    document.getElementById(test.id).focus();
+    todo_is(SpecialPowers.DOMWindowUtils.focusedActionHint, test.hint, test.desc);
+  }
+});
+
+add_task(async function dynamicChange() {
+  let element = document.getElementById("l1");
+  element.focus();
+  is(SpecialPowers.DOMWindowUtils.focusedActionHint, "enter",
+     "Initial enterKeyHint");
+
+  element.setAttribute("enterkeyhint", "next");
+  is(SpecialPowers.DOMWindowUtils.focusedActionHint, "next",
+     "enterKeyHint in InputContext has to sync with enterkeyhint attribute");
+
+  element.enterKeyHint = "search";
+  is(SpecialPowers.DOMWindowUtils.focusedActionHint, "search",
+     "enterKeyHint in InputContext has to sync with enterKeyHint setter");
+
+  document.getElementById("l2").setAttribute("enterkeyhint", "send");
+  is(SpecialPowers.DOMWindowUtils.focusedActionHint, "search",
+     "enterKeyHint in InputContext keeps focused enterKeyHint value");
+
+  // Storing the original value may be safer.
+  element.enterkeyhint = "enter";
+  document.getElementById("l2").enterKeyHint = "done";
+});
+</script>
+</pre>
+</body>
+</html>