HTML Checking for Large Sites
Rocket Validator integrates the W3C Validator HTML checker into an automated web crawler.
HTML issues tagged as br.
The <br> tag inserts a line break, and it’s self-closing so you can use either <br> or <br/> but </br> is invalid.
As the <br> tag is a void element, it doesn’t need a closing tag, so <br> is preferred to <br/>.
First line<br> Second line is also valid but discouraged.<br/> Third line is invalid</br>
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