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The form is actually an iframe without stylesheets thats why has Times New Roman font by default: https://buy.itunes.apple.com/WebObjects/MZFinance.woa/wa/con...

I don't see any serif fonts on that page.

I do as well, Chrome on Mac: http://cl.ly/OveN

I do. The text above is sans serif, but the form fields are serif. (Chrome @ Windows 7)

The form is actually in an <iframe>, and the iframe content is completely unstyled, so presumably if your browser's default font is sans-serif then you won't see it.

Quite sloppy, IMO.

Not seeing that on Firefox for OS X: http://cl.ly/image/3m3j3E061z1F

Chrome on OS X doesn't like it, at all :(

http://i.imgur.com/PMcxkDt.png

Looks like you are using HTTPS Everywhere? Try disabling it or click the icon to load the insecure script.

This looks to be a Chrome issue. Neither Firefox, Internet Explorer, Opera or Safari users see this.