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Updated: 2 April 2000

NOTE: The values on this chart are weighted. Please see the detailed explanation below for more information.

	Windows95/NT	Macintosh	Notes
Navigator 4	`38.8% / 27.9%`	`38.8% / 24.3%`
Explorer 3	`22.6% / 19.2%`	`13.9% / 13.4%`
Explorer 4	`69.9% / 67.4%`	`77.2% / 71.4%`	Mac column refers to IE4.5
Explorer 5	`72.9% / 69.6%`	`99.4% / 98.9%` (1)
Opera 3	`85.1% / 83.0%`	`--`	Refers to version 3.6

Explanation

Here's how the numbers break down: the first value gives the percentage of property/value combinations (and so forth) which are supported by that browser, as a percentage of all the features which we track, as listed in the Guide's Master Support Chart. The second number shows the number of properties, pseudo-classes, and other CSS1 features which are fully supported. So, for example, if a browser supports all values of vertical-align, it counts toward the second percentage, but every supported value of that property counts toward the first. The first number is thus a better indication of overall support, while the second is a good measure of how far the developers have gotten in implementing the CSS1 specification.

Figure 1.
Y	2
Q	1.5
P	1
N	0
B	-0.5

In order to improve the accuracy of the Leader Board, a weighting system has been adopted. The weighting of the rankings on the Master Support Chart uses a point system. The points given for each ranking are as shown in Figure 1. The use of such a system will, it is hoped, provide a much more accurate picture of CSS1 support among current browsers than was possible in the past.

Remember, the changes in numbers shown above are due to the improved nature of the ranking. Web browsers are no better (or worse) at supporting CSS than they were before. The only difference is that we've finally gotten a clearer picture of what the situation really is.

(1) In fact, MacIE5 is probably at 100 percent in both categories. Its rating is due to one "quirk" for float, which is still being investigated; and for the "P" and "N" found in text-decoration with regards to blink. Since blinking is not required in CSS1, MacIE should not be penalized for this. However, since the rest of the numbers were calculated as though blinking were required, MacIE5 is rated in the same way. The Leader Board will be overhauled in the near future to award bonus points for non-required behavior, instead of penalizing for its absence. At that time, MacIE5 may well achieve a dual 100 percent rating—stay tuned!

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