This isn't documented anywhere that I know of nor is it in the spec, but you if you add a results parameter on the input, WebKit will apply a little magnifying glass with a dropdown arrow showing previous results.
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How To Use CSS3 Pseudo-Classes - Smashing Magazine - 0 views
A practical guide to writing technical specs - Stack Overflow Blog - 7 views
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4.12 Links - HTML5 - 0 views
4.12 Links - HTML5 - 0 views
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Introduction - Material Design - Google Design Guidelines - 14 views
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