Small Issue with borders in progress in polyfilled browsers

A small bug appears when a border is applied to the progress bar. If the value of the progress bar is set to zero, the progress bar increases in width slightly, until the value is changed to a non-zero value. You can see what I mean here:

http://www.useragentman.com/tmp/progressPolyfill/test1.html

In order to fix this issue, I changed line 161 in your script from:

if(progress.position !== -1) {
progress.style.paddingRight = progress.offsetWidth *
(1-progress.position) + 'px';
}

to this:

if(progress.position !== -1) {
progress.style.paddingRight = progress.clientWidth *
(1-progress.position) + 'px';
}

(Note the change from offsetWidth to clientWidth). When this is applied, the jump in width doesn't happen anymore, as seen here:

http://www.useragentman.com/tmp/progressPolyfill/test1-fixed.html

Inspect the script around line 161 and compare the reported offsetWidth and clientWidth behavior. Verify the change against the linked test1.html and test1-fixed.html cases; done means a zero-valued progress bar no longer grows slightly when a border is applied in polyfilled browsers.