Line break inside a <legend> test
This test is to determine if line breaks are allowed inside the <legend> element. This is based on the W3C content model, which defines content that must be included as children and descendants of the element.
Example
<form action="#">
<fieldset>
<legend>Something<br> Another thing</legend>
</fieldset>
</form>
Results
The <legend> element can contain phrasing content, optionally intermixed with heading content.