Reproducible: add |outline: auto;| to something with a debug build.

https://drafts.csswg.org/css-ui/#outline > In addition, in CSS3, outline-style accepts the value auto. The auto value permits the user agent to > render a custom outline style, typically a style which is either a user interface default for the > platform, or perhaps a style that is richer than can be described in detail in CSS, e.g. a rounded edge > outline with semi-translucent outer pixels that appears to glow. As such, this specification does not > define how the outline-color is incorporated or used (if at all) when rendering auto style outlines. User > agents may treat auto as solid.

Bug 1026641 put this behind a preference.

Bug 1215596 - Don't try to render 'outline: auto' if pref off. r=roc

Comment on attachment 8675028 [details] MozReview Request: Bug 1215596 - outline: auto; will render as outline: solid; when disabled. r=roc https://reviewboard.mozilla.org/r/22323/#review19949 ::: layout/base/nsCSSRenderingBorders.cpp:759 (Diff revision 1) > + return; I don't think this is the right fix. I don't think we should reach here with NS_STYLE_BORDER_STYLE_AUTO if the pref is disabled (or even if it's enabled, actually, since 'auto' should be rendered by our theme engine). I think the correct fix is for nsCSSRendering::PaintOutline to convert NS_STYLE_BORDER_STYLE_AUTO to NS_STYLE_BORDER_STYLE_SOLID when the pref is disabled. Currently we only do that conversion when the pref is enabled but outline:auto is not supported by the theme enggine.

Yea, I followed what I felt was the intention of the patch which was to not render. I think given the spec it make sense to just treat it as solid like you said given that we still accept the CSS value. I'll write up that up.

Comment on attachment 8675028 [details] MozReview Request: Bug 1215596 - outline: auto; will render as outline: solid; when disabled. r=roc Bug 1215596 - outline: auto; will render as outline: solid; when disabled. r=roc

Comment on attachment 8675028 [details] MozReview Request: Bug 1215596 - outline: auto; will render as outline: solid; when disabled. r=roc https://reviewboard.mozilla.org/r/22323/#review19951

https://hg.mozilla.org/integration/mozilla-inbound/rev/16814bfd4e1a30c48110aa555f2107d192fc89a4 Bug 1215596 - outline: auto; will render as outline: solid; when disabled. r=roc

Is it normal that Yahoo Mail displays a blue rectangle after a link in email has been clicked in FF44+?