Cross-Browser
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Compliance

What is it?
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A Cross-Browser Compliant site LOOKS THE SAME in all five major web
browsers. For a variety of reasons, it is not possible to create a site that
is identical across all versions of all browsers.

Compatibility
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Different web browsers display the same code differently, so all designs
and scripts are tested for compatability with the five most common web
browsers: FireFox, Internet Explorer (5.5, 6, 7, 8), Chrome, Safari, and Opera.

Why are they different?
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Browser applications established during the evolution of the Web contain
OLD segments of code. Because updating these segments implies a major
re-write, standards have not been enforced.

As you can see, every major browser displays the SAME PAGE differently,
with subtle and not-so-subtle differences:

Internet Explorer  ▼ Firefox  ▼
▶ margins
▶ text size
▶ text style
▶ spacing
▶ transparency
▶ padding
 
Chrome  ▼ Safari  ▼ Opera  ▼