In Blink, 'results' attribute just adds a magnifier icon to an INPUT field. It's a cosmetic feature. In desktop Safari, it controls how many submitted queries are shown in a popup opened by clicking the magnifier icon. This is a WebKit-extension, and it seems no one tried to standardize it.
Docs: https://developer.apple.com/library/iad/documentation/AppleApplications/Reference/SafariHTMLRef/Articles/Attributes.html#//apple_ref/doc/uid/TP40008058-results