d80d6ea3f6
Previously, styling of `<code>` elements utilized the `:not()` CSS pseudo-class with multiple selectors (`:not(h1, h2, ...)`). It turns out that older browsers (such as IE11) do not support multiple selectors in a single `:not()` instance. (See [MDN][1] and [CanIUse][2] for more info.) This commit fixes `<code>` styling to use multiple separate `:not()` instances instead (`:not(h1):not(h2)...`), so that they are styled correctly on older browsers as well. NOTE: This change seems to trigger some kind of bug in LightHouse that causes the a11y score of `/start` to be calculated as 0 (which is clearly wrong). This happens on Linux (tested on CI and locally using the Windows Subsystem for Linux (WSL)) - on Windows the score is computed correctly as 98/100. ([Example failure][3]) The bug seems to be related to the layout of the content and goes away if we change the viewport size (for example, switching to LightHouse's `desktop` config) or make another change that affects the content's layout (for example, reducing the padding of `<code>` elements). To work around the issue, this commit updates the `test-aio-a11y.js` script to test `/start-routing` instead of `/start`. [1]: https://developer.mozilla.org/en-US/docs/Web/CSS/:not#description:~:text=Using%20two%20selectors [2]: https://caniuse.com/css-not-sel-list [3]: https://circleci.com/gh/angular/angular/931038 PR Close #41051
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