Commits on Mar 19, 2022

1. Replace dir-dependent margin/margin-left/margin-right with lo… …

   …gical properties
   
   *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

   

   Snuffleupagus committed Mar 19, 2022
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