From: Kenjiro NAKAYAMA <[email-masked]>
Date: Mon, 25 Nov 2013 00:34:52 +0900

The following HTML(test.html) reproduces the bug.

* Reproduce the bug.

 1. M-x ewww-open-file RET
 2. ~/$PATH_TO_THE_FILE/test.html
 3. select box with options(Value A to D) dispears.

-- test.html --
<html>
<head><title>SELECT TEST</title></head>
<body>

<form method="POST" action="./dummy.php">
<input type="text" name="text1">
<input type="submit" name="btn1" value="val1">

<select>
<optgroup label="group 1">
<option value="a">Value A</option>
<option value="b">Value B</option>
</optgroup>
<optgroup label="group 2">
<option value="c">Value C</option>
<option value="d">Value D</option>
</optgroup>
</select>

</form>
</body>
</html>
--