Adding a placeholder to searchform.php breaks form submission.

[mwilliam]

Without a placeholder attibute, the form submits successfully ("?s=[search-term]"):

    <form role="search" method="get" id="searchform" action="<?php bloginfo('url');?>/">
        <div>
            <label class="screen-reader-text" for="s">Search for:</label>
            <input type="text" value="" name="s" id="s">
            <input type="submit" id="searchsubmit" value="Search">
        </div>
    </form>

With a placeholder attibute, however, the form submits blank ("?s=") regardless of the presence of the value attribute:

    <form role="search" method="get" id="searchform" action="<?php bloginfo('url');?>/">
        <div>
            <label class="screen-reader-text" for="s">Search for:</label>
            <input type="text" value="" placeholder="Search" name="s" id="s">
            <input type="submit" id="searchsubmit" value="Search">
        </div>
    </form>

This is a bug on all modern browsers (legacy is excluded because the placeholder attribute is not supported).

Not sure I see how this is a WordPress bug?

Well, it works in 3.4.1. How is this not a WP bug?