What works in which browser and what doesn't.

by Ciff Wootton

Here's a list of the percentage of JavaScript features that work in each of the popular browsers. Sadly, it looks like only about 31% of the features work with both 3.0 and above browsers. I know site developers who have decided to simply not use JavaScript at all rather than mess with the compatibility issues.
August 26, 1998

IE 3 & 4	243	31.68%
Nav 3 & 4	373	48.63%
IE4 & NAV 4	425	55.41%
All 4 browsers	240	31.29%

A further caveat: This suggests areas that you should check rather than just go on my say so. Some features could get implemented at intermediate releases such as 4.04 where they weren't available at 4.03 or might be available only on certain platforms. So we are simplifying things a little when we talk about Nav 3 vs. Nav 4.

There is a Web Standards pressure group that is trying to get some groundswell of public opinion going to make Microsoft and Netscape toe the line and at least support the W3C and other published standards. They are at http://www.webstandards.org/ and are called 'The Web Standards Project'.

Here's the whole, frightening list screen through window:

screen	availHeight	No	Yes	No	Yes
screen	availLeft	No	No	No	Yes
screen	availTop	No	No	No	Yes
screen	availWidth	No	Yes	No	Yes
screen	colorDepth	No	Yes	No	Yes
screen	height	No	Yes	No	Yes
screen	pixelDepth	No	No	No	Yes
screen	width	No	Yes	No	Yes
select	blur()	Yes	Yes	Yes	Yes
select	click()	Yes	Yes	Yes	Yes
select	focus()	Yes	Yes	Yes	Yes
select	form	Yes	Yes	Yes	Yes
select	length	Yes	Yes	Yes	Yes
select	name	Yes	Yes	Yes	Yes
select	onblur	Yes	Yes	Yes	Yes
select	onchange	Yes	Yes	Yes	Yes	Bugged in Nav 2
select	onfocus	Yes	Yes	Yes	Yes
select	options[]	Limited	Yes	Yes	Yes	Enhanced in JS 1.1
select	selectedIndex	Limited	Yes	Yes	Yes	Writeable in JS 1.1
select	type	No	Yes	Yes	Yes
select	value	Yes	Yes	Yes	Yes	The values actually come from the options owned by the select not the select itself
string	anchor()	Yes	Yes	Yes	Yes
string	big()	Yes	Yes	Yes	Yes
string	blibk()	Yes	Yes	Yes	Yes
string	bold()	Yes	Yes	Yes	Yes
string	charAt()	Yes	Yes	Yes	Yes
string	charCodeAt()	No	Yes	No	Limited	Incomplete support for unicode characters in Nav 4
string	concat()	No	Yes	No	Yes
string	fixed()	Yes	Yes	Yes	Yes
string	fontcolor()	Yes	Yes	Yes	Yes
string	fontSizefontsize()	Yes	Yes	Yes	Yes
string	fromCharCode()	No	Yes	No	Limited	Incomplete support for unicode characters in Nav 4
string	indexOf()	Yes	Yes	Bugged	Yes	Nav 2 & 3 have bugs when the start is beyond the end of the string
string	italics()	Yes	Yes	Yes	Yes
string	lastIndexOf()	Yes	Yes	Yes	Yes
string	length	Yes	Yes	Yes	Yes
string	link()	Yes	Yes	Yes	Yes
string	match()	No	Yes	No	Yes
string	replace()	No	Yes	No	Yes
string	search()	No	Yes	No	Yes
string	slice()	No	Yes	No	Yes
string	small()	Yes	Yes	Yes	Yes
string	split()	No	Yes	Yes	Yes
string	strike()	Yes	Yes	Yes	Yes
string	sub()	Yes	Yes	Yes	Yes
string	substr()	No	Bugged	No	Bugged	Negative values for start are bugged in IE 4
string	substring()	Yes	Yes	Yes	Yes
string	sup()	Yes	Yes	Yes	Yes
string	toLowerCase()	Yes	Yes	Yes	Yes
string	toUpperCase()	Yes	Yes	Yes	Yes
style	background	No	Yes	No	No
style	background-Attachment	No	Yes	No	No
style	backgroundColor	No	Yes	No	Yes
style	backgroundImage	No	Yes	No	Yes
style	backgroundPosition	No	Yes	No	No
style	backgroundPositionX	No	Yes	No	No
style	backgroundPositionY	No	Yes	No	No
style	backgroundRepeat	No	Yes	No	No
style	border	No	Yes	No	No
style	borderBottom	No	Yes	No	No
style	borderBottomColor	No	Yes	No	No
style	borderBottomStyle	No	Yes	No	No
style	borderBottomWidth	No	No	No	Yes
style	borderBottomWidth	No	Yes	No	No
style	borderColor	No	Yes	No	Yes
style	borderLeft	No	Yes	No	No
style	borderLeftColor	No	Yes	No	No
style	borderLeftStyle	No	Yes	No	No
style	borderLeftWidth	No	No	No	Yes
style	borderLeftWidth	No	Yes	No	No
style	borderRight	No	Yes	No	No
style	borderRightColor	No	Yes	No	No
style	borderRightStyle	No	Yes	No	No
style	borderRightWidth	No	No	No	Yes
style	borderRightWidth	No	Yes	No	No
style	borderStyle	No	Yes	No	Yes
style	borderTop	No	Yes	No	No
style	borderTopColor	No	Yes	No	No
style	borderTopStyle	No	Yes	No	No
style	borderTopWidth	No	No	No	Yes
style	borderTopWidth	No	Yes	No	No
style	borderWidth	No	Yes	No	No
style	borderWidths()	No	No	No	Yes
style	clear	No	Yes	No	Yes
style	clip	No	Yes	No	No
style	color	No	Yes	No	Yes
style	cssText	No	Yes	No	No
style	cursor	No	Yes	No	No
style	display	No	Yes	No	Yes
style	filter	No	Yes	No	No
style	fonhtWeight	No	Yes	No	No
style	font	No	Yes	No	No
style	fontFamily	No	Yes	No	Yes
style	fontSize	No	Yes	No	Yes
style	fontStyle	No	Yes	No	Yes
style	fontVariant	No	Yes	No	No
style	fontWeight	No	No	No	Yes
style	height	No	Yes	No	No
style	left	No	Yes	No	No
style	letterSpacing	No	Yes	No	No
style	lineHeight	No	Yes	No	Yes
style	listStyle	No	Yes	No	No
style	listStylePosition	No	Yes	No	No
style	listStyleType	No	No	No	Yes
style	listStyleType	No	Yes	No	No
style	listyStyleImage	No	Yes	No	No
style	margin	No	Yes	No	No
style	marginBottom	No	Yes	No	Yes
style	marginLeft	No	No	No	Yes
style	marginRight	No	Yes	No	Yes
style	margins()	No	No	No	Yes
style	marginTop	No	Yes	No	Yes
style	overflow	No	Yes	No	No
style	paddingBottom	No	Yes	No	Yes
style	paddingLeft	No	Yes	No	Yes
style	paddingRight	No	Yes	No	Yes
style	paddings()	No	No	No	Yes
style	paddingTop	No	Yes	No	Yes
style	pageBreakAfter	No	Yes	No	No
style	pageBreakBefore	No	Yes	No	No
style	pixelHeight	No	Yes	No	No
style	pixelLeft	No	Yes	No	No
style	pixelTop	No	Yes	No	No
style	pixelWidth	No	Yes	No	No
style	posHeight	No	Yes	No	No
style	position	No	Yes	No	No
style	posLeft	No	Yes	No	No
style	posTop	No	Yes	No	No
style	posWidth	No	Yes	No	No
style	styleFloat	No	Yes	No	No
style	textAlign	No	Yes	No	Yes
style	textDecoration	No	Yes	No	Yes
style	textIndent	No	Yes	No	Yes
style	textTransform	No	Yes	No	Yes
style	top	No	Yes	No	No
style	verticalAlign	No	Yes	No	No
style	visibility	No	Yes	No	No
style	whiteSpace	No	No	No	Yes
style	width	No	Yes	No	No
style	zindex	No	Yes	No	No
submit	blur()	Yes	Yes	Yes	Yes
submit	click()	Yes	Yes	Yes	Yes
submit	focus()	Yes	Yes	Yes	Yes
submit	form	Yes	Yes	Yes	Yes
submit	name	Yes	Yes	Yes	Yes
submit	onblur	Yes	Yes	Yes	Yes
submit	onclick	Limited	Yes	Yes	Yes	Enhanced in JS 1.1
submit	onfocus	Yes	Yes	Yes	Yes
submit	type	No	Yes	Yes	Yes
submit	value	Bugged	Yes	Yes	Yes	Possibly buggy in IE 3
sun		No	No	Yes	Yes
text	blur()	Yes	Yes	Yes	Yes
text	defaultValue	Yes	Yes	Yes	Yes
text	focus()	Yes	Yes	Yes	Yes
text	form	Yes	Yes	Yes	Yes
text	name	Yes	Yes	Yes	Yes
text	onblur	Yes	Yes	Yes	Yes
text	onchange	Yes	Yes	Yes	Yes
text	onfocus	Yes	Yes	Yes	Yes
text	select()	Yes	Yes	Yes	Yes
text	type	No	Yes	Yes	Yes
text	value	Bugged	Yes	Yes	Yes	Possibly buggy in IE 3
textarea	blur()	Yes	Yes	Yes	Yes
textarea	defaultValue	Yes	Yes	Yes	Yes
textarea	focus()	Yes	Yes	Yes	Yes
textarea	form	Yes	Yes	Yes	Yes
textarea	name	Yes	Yes	Yes	Yes
textarea	onblur	Yes	Yes	Yes	Yes
textarea	onchange	Yes	Yes	Yes	Yes
textarea	onfocus	Yes	Yes	Yes	Yes
textarea	select()	Yes	Yes	Yes	Yes
textarea	type	No	Yes	Yes	Yes
textarea	value	Bugged	Yes	Yes	Yes	Possibly buggy in IE 3 and also somewhat buggy in Nav 2

This is a prety long list so we have split it up over several pages. They are still a bit slow to load due to their size.

A - event
event - layer
layer - screen
screen - window
window - window