Warning: this post is old and might not reflect the current state of the art
<input autofocus="autofocus" /> will put the focus on the specified HTML element when the page loads
<a href="file.pdf" download="pdf-file">Download</a> will download the specified file, with the name provided.
<div hidden="hidden"></div> despite putting the presentation in the HTML, which is bad, this can sometimes turn out useful.
Turning off (or on) spellchecking
Operating systems configured to spell check everything a user types can sometimes get in the way -
<input type="text" spellcheck="true|false"> can help.
Auto suggestion text input control
<input list="mylist" name="mylist" > <datalist id="mylist"> <option value="CSS"> <option value="HTML"> <option value="PHP"> <option value="Jquery"> <option value="Wordpress"> </datalist>
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