<!DOCTYPE html>

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Copyright 2015 Google Inc. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

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distributed under the License is distributed on an "AS IS" BASIS,
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<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<body>

<input type="button" wd-element-id="button" onclick="buttonClicked()" value="button">

<div wd-element-id="div">Button not clicked</div>

<script>
    function buttonClicked() {
        document.querySelector('[wd-element-id="div"]').textContent = 'Button clicked';
    }
</script>
</body>
</html>