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*Please note:* This is another step in what will, time permitting, become a series of patches to simplify/modernize the viewer CSS. Rather than having to manually specify ltr/rtl-specific margin-values in the CSS, we can use logical margin instead (and similar for some related left/right occurrences). These logical properties depend on, among other things, the direction of the HTML document which we *always* specify in the viewer. Given that most of these logical CSS properties are fairly new, and that cross-browser support is thus somewhat limited (see below), we need to use a couple of PostCSS plugins (see below) in order to support this in the GENERIC viewer. - https://developer.mozilla.org/en-US/docs/Web/CSS/margin-inline#browser_compatibility - https://developer.mozilla.org/en-US/docs/Web/CSS/margin-inline-start#browser_compatibility - https://developer.mozilla.org/en-US/docs/Web/CSS/margin-inline-end#browser_compatibility - https://developer.mozilla.org/en-US/docs/Web/CSS/inset-inline-start#browser_compatibility - https://developer.mozilla.org/en-US/docs/Web/CSS/inset-inline-end#browser_compatibility --- - https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-logical - https://github.com/csstools/postcss-plugins/tree/main/plugins/postcss-dir-pseudo-class