Rocket Validator integrates the W3C Validator HTML checker into an automated web crawler.
HTML issues tagged as accept.
The accept attribute may be specified to provide browsers with a hint of what file types will be accepted on an <input> element. It expects a comma-separated list of allowed file types. Refer to the list of media types to check the accepted tokens. In this example, the first line is invalid while the second is valid:
<input name='file' type='file' accept='doc, docx, pdf' /> <input name='file' type='file' accept='text/doc, text/docx, application/pdf' />
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