[Bug 63242] Re: Unstyled buttons doesn't use Ubuntu's theme

[fafek2]

Well, yes.

Form buttons should be rendered using Ubuntu's selected theme. Each form
item (checkboxes too) on this site: http://www.w3.org/2000/07/8378/xhtml
/media-types/test.xml#forms.heading should not be displayed in
Win98-style.

In fact, on 404 error pages displayed by browser, "Try again" button is displayed correctly.
However, as far as I know, the button declaration is written in XUL with this code so it's not ordinary form button:

<xul:button
xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
id="errorTryAgain" label="Spróbuj ponownie" oncommand="retryThis();"/>

Maybe this will help?

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Unstyled buttons doesn't use Ubuntu's theme
https://launchpad.net/bugs/63242