On Aug 4, 2016 1:43 AM, "Jos van den Oever" <j...@vandenoever.info> wrote: > > Hi Regina, > > Thanks for the elegant ODG test file. > > On Wednesday 03 August 2016 16:31:18 you wrote: > > Jos, Thorsten, should we adapt the specification to the way LibreOffice > > and Calligra do it? It would implicate, that the z-index need not be > > unique over the whole document, but only locally on the level. > > Yes we should propose it. This is how it works in CSS and XSL-FO and ODF > should be the same and at least LO and Calligra implementations work like how > CSS and XSL-FO describe it. > > Many complicated cases of CSS do not apply to ODF, because in ODF drawings, > everything is positioned. One thing we need to specify is what constitutes a > stacking context in ODF. Is it just draw:g? > > ODF specification currently does not mention what the default z-index is. I > assume it is 0. In ODF, index is a non-negative integer. In CSS, it's an > integer. > > I am wondering about the usefulness of z-index in ODF though. If z-index is > only local, one might just as well change the order of the elements in their > parent. > > In CSS, z-index is useful, because CSS is meant to style documents that are > independent of the CSS. CSS does not change the document it styles, but it can > modify the stacking order for styling purposes. In ODF, the z-index is > directly on the elements and not on the style. So the question is: is there > meaning in the element order besides the stacking order? > Yes there is meaning in element order. According to the ODF specificatin, elements without a z-index will render in the order they appear in the document. What I'm not sure about, is that if there is an element without a z-index in the middle of several elements with z-inices, will the element render first, last, or in the middle? > > Cheers, > Jos > >
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