import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

This commit is contained in:
Roy Tam 2018-01-19 03:59:58 +08:00
commit dcd9973243
150858 changed files with 23884658 additions and 0 deletions

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<!DOCTYPE html>
<!-- form with only valid elements -->
<html>
<head>
<style>
form:invalid { display: none; }
</style>
</head>
<body>
<form>
<input value='foo' required>
</form>
</body>
</html>