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Copyright 2016 Google Inc.
Licensed under the Apache License, Version 2.0 (the "License");
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<!doctype html>
<html>
<head>
<title>Activity Tabs Demo</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<h1>Activity Tabs Demo</h1>
<ol>
<li>Make a <a href="https://developers.google.com/web/tools/chrome-devtools/evaluate-performance/reference#record-runtime">runtime performance recording</a>.</li>
<li>Press <b>go</b>. The button is disabled and the page hangs.</li>
<li>Stop recording once the button becomes enabled again.</li>
</ol>
<p>See <a href="https://developers.google/com/web/tools/chrome-devtools/evaluate-performance/reference#activity" target="_blank">View activities</a> for context.</p>
<button>go</button>
<script>
var button = document.querySelector('button');
function wait(ms){
var start = new Date().getTime();
var end = start;
while(end < start + ms) {
end = new Date().getTime();
}
}
function a() {
wait(500);
}
function b() {
wait(500);
}
function c() {
wait(500);
}
button.addEventListener('click', () => {
button.disabled = true;
a();
b();
c();
button.disabled = false;
});
</script>
</body>
</html>
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