Results of browser testing for when elements take the focus

		no tabindex				tabindex 0				tabindex -1
		fields	links	editable	plain	fields	links	editable	plain	fields	links	editable	plain
Opera 12 / Mac (with full keyboard access)	keyboard	Y1	S1	Y1	N	Y1	Y1	Y1	Y1	S1	S1	N	N
	mouse	Y1	Y0	Y0	N	Y1	Y0	Y0	Y0	Y1	Y0	Y0	Y0
Opera 12 / Win7	keyboard	Y1(e)	S1	Y1	N	Y1(e)	Y1	Y1	Y1	S1	S1	N	N
	mouse	Y0(f)	Y0	Y0	N	Y0(f)	Y0	Y0	Y0	Y0(f)	Y0	Y0	Y0
Firefox 4,8,14,22 / Mac (with full keyboard access)	keyboard	Y1	Y1	Y1	N	Y1	Y1	Y1	Y1	N	N	N	N
	mouse	A1	Y½	Y1	N	A1	Y½	Y1	Y1	A1	Y½	Y1	Y1
Firefox 22 / Win7	keyboard	Y1	Y1	Y1	N	Y1	Y1	Y1	Y1	N	N	N	N
	mouse	Y½(d)	Y½	Y½	N	Y½(d)	Y½	Y½	Y½	Y½(d)	Y½	Y½	Y½
Firefox 3.6 / Mac (with full keyboard access)	keyboard	Y1	Y1	Y1	N	Y1	Y1	Y1	Y1	N	N	N	N
	mouse	Y1	Y1	Y1	N	Y1	Y1	Y1	Y1	Y1	Y1	Y1	Y1
Chrome 28 / Mac (with full keyboard access)	keyboard	Y1(a)(b)	Y1	Y1	N	Y1(a)(b)	Y1	Y1	Y1	N	N	N	N
	mouse	B1(b)	N	Y1	N	B1(b)	Y1	Y1	Y1	B1(b)	Y1	Y1	Y1
Chrome 28 / Win7	keyboard	Y1	Y1	Y1	N	Y1	Y1	Y1	Y1	N	N	N	N
	mouse	B1	N	Y1	N	B1	Y1	Y1	Y1	B1	Y1	Y1	Y1
Safari 5 / Mac (with full keyboard access)	keyboard	Y1	Y1	Y1	N	Y1	Y1	Y1	Y1	N	N	N	N
	mouse	C1	N	Y1	N	C1	Y1	Y1	Y1	C1	Y1	Y1	Y1
IE10 / Win7	keyboard	Y1	Y1	Y0	N	Y1	Y1	Y1	Y1	N	N	N	N
	mouse	Y1(c)	Y0	Y0	N	Y1(c)	Y0	Y0	Y0	Y1(c)	Y0	Y0	Y0
IE8 / WinXP	keyboard	Y1(g)	Y1	Y0	N	Y1(g)	Y1	Y1	Y1	D1	N	N	N
	mouse	Y1(g)	Y1	Y0	N	Y1	Y1	Y1	Y1	Y1(g)	Y1	Y0	Y0

Key to the letter-codes used in the previous table

Y	elements take the focus
N	elements do not take the focus
S	elements can only take the focus via spatial navigation (in Opera)
A	all types of field take the focus except radio, checkbox, or either type of button (unsupported color and range behave as text)
B	all types of field take the focus except radio, checkbox, either type of button, color, or range
C	all types of field take the focus except radio, checkbox, either type of button, or range (unsupported color behaves as text)
D	only radio fields take the focus
1	browser always shows native focus indication (and form fields and editable elements also have a cursor)
0	browser never shows native focus indication (but form fields and editable elements still have a cursor)
½	browser only shows native focus indication if Tab has been used this page session
(a)	all types of field show native focus indication except range
(b)	date and time fields (all variants) retain native focus indication even after they've blurred
(c)	all types of field show native focus indication except radio, checkbox, either type of button, and range
(d)	either type of button shows partial native focus indication even if Tab has not been used this page session
(e)	text, textarea, and number fields only show native focus indication if spatial navigation is used
(f)	selects and either type of button do show partial native focus indication
(g)	text and textarea fields do not show native focus indication