My little case that (maybe?) triggered this. Authored HTML: ```html <div class="book"> <img src="" alt=""> ... </div> ``` CSS: ```css .book :first-child { /* size the image */ } ``` Production HTML: ```html <div class="book"> <script src="third-party-performance-thing.js"></script> <img src="" alt=""> ... </div> ``` So that CSS now fails because it's targeting the wrong thing. Obviously can be worked around, but this CSS might be more resilient? ```css .book :first-child:visible { /* size the image */ } ``` -- GitHub Notification of comment by chriscoyier Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/5827#issuecomment-752112696 using your GitHub account -- Sent via github-notify-ml as configured in https://github.com/w3c/github-notify-ml-configReceived on Tuesday, 29 December 2020 15:07:08 UTC
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