Now that HTML5 is enabled, there are two endemic HTML validation errors:
- Attribute width not allowed on element button at this point.
- Attribute height not allowed on element button at this point.
The issue is in the markup for the search button:
- <button name="button" title="Search Wikipedia for this text" id="searchButton" width="12" height="13">
The width and height attributes are not valid for the button element:
The search icon is 12 x 13 pixels, thus this markup is not needed.
HTML validation is important. When editors manually create HTML ids, such as certain citation templates, we recommend they validate the page to ensure they have no duplicates. They get bogged down in endemic validation errors.