With 3.6 introducing many HTML5 improvements the need for custom
searchform and comment templates will vanish. To cope with core's
.screen-reader-text class, let's make the switch early.
Commit also adds core's focus styles for screen reader texts, so they
can actually be used.
- Add "searchform" class to form element, easier styling
- Better gettext for label, placeholder, and submit text, easier for translators
- Remove "name" attribute from submit button, not needed and it adds cruft to URL
See also http://core.trac.wordpress.org/ticket/15081
It may be useful to display what the user searched for in the search input, especially on pages like no-results.php where the search query is not displayed anywhere.