Firefox 4+	Safari 5+	Safari 5-	Chrome 6+	Opera 11+	IE 10+	Android 3+

Firefox 4+	Safari 5+	Safari 5-	Chrome 6+	Opera 11+	IE 10+	Android 3+

The Low Down

The first input or textarea in source order that has the autofocus attribute will be focused on page load.

• In browsers without autofocus support, no fields will be focused on page load, unless otherwise given focus with JavaScript.
• Originally in the specification, the last element with the autofocusattribute received focus. Safari still does this. IE, Firefox, Chrome and Opera focus on the first occurence of the attribute.
• Warning: this attribute will force a page scroll to the field with the autofocus attribute set, even within an iframe. So: know your audience, know the position of the form.
• If you use a fallback, make sure to fire it on DOM ready rather than onwindow.load. Would be way jarring to have the page position jump after a user may already be interacting with the page.
• It’s probably good that Mobile WebKit doesn’t support the autofocusattribute as the zooming/keyboard opening would be too in-your-face in most circumstances.
• Recommendation: Don’t use this attribute.