Firefox v52.0.1 has a problem with CSS position: fixed

[CharlesEF]

Hi All,

I think I have found a bug in FF. See http://www.cef-inc.com/temp.html for proof. The page consists of 3 sections (CSS), red is the header, yellow is the content and blue is the footer. The menu is contained in the content section and has position: fixed defined in the #menu. I have found that when position: fixed is used the white background of the menu extends to cover the scroll bar. If position: relative or absolute is used then the background does not cover the scroll bar.

Is this a bug with position: fixed (CSS) in Firefox?


Thanks for any help,

Charles

[therube]

Maybe related, layout.css.style-attr-with-xml-base.disabled in about:config ?

[CharlesEF]

According to that page it affects XHTML only, not HTML. My test page is HTML and CSS only.

[CharlesEF]

I don't know if I did something wrong with this version of the page so I started over. This time I got it working. Hopefully, someone can tell me if I did something wrong or that this is a bug. The new page is http://www.cef-inc.com/temp1.html