Is there a need to test webpages in both Safari and Chrome?

Question

Since both Safari and Chrome use Webkit, is it superfluous to test for compatibility in both browsers if a webpage looks fine in one?

Answer 1

No, it is not.

As far as I have experienced, Safari and Chrome (on OS X) seem to render fonts differently. Safari will display fonts without a specified size significantly smaller than in Chrome.

Chrome:

Safari:

Answer 2

You should test both browsers if your site has any significant amount of JavaScript, as there are differences. For example, the following causes a JavaScript error in Safari but not Chrome.

var x = new Date('02-22-2011');