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>
<!-- Nested fieldsets should be assigned validation correctly -->
<html>
<head>
<style>
fieldset:valid { background-color: green; }
fieldset:invalid { background-color: red; }
</style>
</head>
<body>
<fieldset>
<fieldset>
<input>
</fieldset>
<fieldset>
<input required>
</fieldset>
</fieldset>
</body>
</html>