Change record status: 
Project: 
Introduced in branch: 
8.9.x
Introduced in version: 
8.9.15
Description: 

Instead of resetting off-canvas styles by using an asterisk selector with negation to exclude elements that shouldn't be targeted, Drupal now explicitly lists the elements that should be reset.

Before:

#drupal-off-canvas *:not(div),
#drupal-off-canvas *:not(svg *),
#drupal-off-canvas *:after,
#drupal-off-canvas *:before {
      all: initial;
      box-sizing: border-box;
      text-shadow: none;
      -webkit-font-smoothing: antialiased;
      -webkit-tap-highlight-color: initial;
}

After:

#drupal-off-canvas {
  & span,
  & applet,
  & object,
  & iframe,
  & h1,
  & h2,
  & h3,
  & h4,
  & h5,
  & h6,
  & p,
  & blockquote,
  & pre,
  & a,
  & abbr,
  & acronym,
  & address,
  & big,
  & button,
  & cite,
  & code,
  & del,
  & dfn,
  & em,
  & img,
  & ins,
  & kbd,
  & q,
  & s,
  & samp,
  & small,
  & strike,
  & strong,
  & sub,
  & sup,
  & tt,
  & var,
  & b,
  & u,
  & i,
  & center,
  & dl,
  & dt,
  & dd,
  & ol,
  & ul,
  & li,
  & fieldset,
  & form,
  & label,
  & legend,
  & table,
  & caption,
  & tbody,
  & tfoot,
  & thead,
  & tr,
  & th,
  & td,
  & article,
  & aside,
  & canvas,
  & details,
  & embed,
  & figure,
  & figcaption,
  & footer,
  & header,
  & hgroup,
  & main,
  & menu,
  & meter,
  & nav,
  & output,
  & progress,
  & ruby,
  & section,
  & summary,
  & time,
  & mark,
  & audio,
  & video,
  & input,
  & select,
  & textarea {
    all: initial;
    box-sizing: border-box;
    text-shadow: none;
    -webkit-font-smoothing: antialiased;
    -webkit-tap-highlight-color: initial;

    &:after,
    &:before {
      all: initial;
      box-sizing: border-box;
      text-shadow: none;
      -webkit-font-smoothing: antialiased;
      -webkit-tap-highlight-color: initial;
    }
  }
}
Impacts: 
Module developers
Themers
Distribution developers
Updates Done (doc team, etc.)
Online documentation: 
Not done
Theming guide: 
Not done
Module developer documentation: 
Not done
Examples project: 
Not done
Coder Review: 
Not done
Coder Upgrade: 
Not done
Other: 
Not done