Why can't this discussion just happen in the bug? dave
On Feb 27, 2013, at 2:31 PM, Xianzhu Wang <[email protected]> wrote: > Hi, > > The question was raised when I was trying to reduce the test case and fix > wkbug.com/110895. > > Consider the following case (we use 'auto' outline style to draw focus rings): > <div style="outline: red auto thin; width: 50px; height: 50px"> > <div style="position: absolute; top: 100px; width: 100px; height: > 25px"></div> > </div> > The outline will be like: > _____ > | | > |_____| > ____________ > |____________| > Things would be more complex (and the visual effect would looks to me more > weird) if we want to draw exact focus ring when the sub-layer is transformed. > > CSS2 (http://www.w3.org/TR/CSS21/ui.html#dynamic-outlines) and CSS3 > (http://dev.w3.org/csswg/css3-ui/#outline) describe outline similarly: > > Outlines may be non-rectangular. For example, if the element is broken across > several lines, the outline should be an outline or minimum set of outlines > that encloses all the element's boxes. > > However, CSS3 also mentions: > > User agents should use an algorithm for determining the outline that encloses > a region appropriate for conveying the concept of focus to the user. > > IMHO, the focus ring shown above couldn't convey the concept of focus well to > the user but seems to confuse the user. In addition, I believe sometimes the > web page designer doesn't actually want an out-of-flow element to be a visual > part of the ancestor elements. > > Tested Firefox19 and IE9 about the behavior. They don't support 'auto' > outline style that WebKit uses to draw focus rings. I tested with 'solid' > style and real focus rings. Firefox draws a single rectangle enclosing the > element and all sub-elements. IE draws outline/focus ring around the element > itself not enclosing sub-elements. (Actually IE's behavior is the same as > WebKit's when outline-style!='auto' -- WebKit draws normal outlines > differently from focus rings). > > I feel that things would be simpler (several bugs would be automatically > fixed) and also clearer to the user/designer by excluding out-of-flow > sub-elements when drawing focus rings. What are your opinions? > > Thanks, > Xianzhu > > > > _______________________________________________ > webkit-dev mailing list > [email protected] > https://lists.webkit.org/mailman/listinfo/webkit-dev
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