Go to acid3.acidtests.org to see if your web browser passes the test.
Acid Tests says, “To pass the test, a browser must use its default settings, the animation has to be smooth, the score has to end on 100/100”
Wikipedia says, “Acid3 test is a web test page from the Web Standards Project that checks a web browser’s compliance with elements of various web standards… If the test is successful, the results of the Acid3 test will display a gradually increasing fraction counter with colored rectangles in the background. The number of subtests passed will indicate the percentage that will be displayed on the screen. This percentage does not represent an actual percentage of conformance as the test does not really keep track of the subtests that were actually started (100 is assumed). Moreover, the browser also has to render the page exactly as the reference page is rendered in the same browser. Like the text of the Acid2 test, the text of the Acid3 reference rendering is not a bitmap, in order to allow for certain differences in font rendering.”