Some useful tricks available in HTML5
Warning: this post is old and might not reflect the current state of the art
Autofocus
<input autofocus="autofocus" /> will put the focus on the specified HTML element when the page loads
Downloading files
<a href="file.pdf" download="pdf-file">Download</a> will download the specified file, with the name provided.
Hide elements
<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>
<option value="HTML"></option>
<option value="PHP"></option>
<option value="Jquery"></option>
<option value="Wordpress"></option>
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