Ran the test PP linked to got the expected (i.e. tested for) results (and the same results) for IE8, IE8 (ie7 compatibility), FF, 3.0.15 and Chrome 3.0.195.38.
If you see three horizontal bars, two fading in from left to right and one fading in from right to left - then your browser supports display of alpha channels in inline PNG images.
If your browser supports alpha you should also see that:
* The image has been composited against the same background color as the rest of this page - white, unless your user stylesheet changed it to a different color.
* the word 'Testing' has smooth, anti-aliased edges edges - look especially at the curve of letters like 'e' and 'g'
* The word 'Testing' is slightly transparent, particularly the 'T', allowing the background color or image to show through.
If you see a textured background behind, your browser also supports background images for CSS stylesheets - congratulations.
Do you people just say things just because you heard it elsewhere or do you check it out first before you post?
It is impossible to enjoy idling thoroughly unless one has plenty of work to do. -- Jerome Klapka Jerome