Make HTML Elements Full-width Automatically via JavaScript and CSS

/ Yihui Xie | 谢益辉

Original link: https://yihui.org/en/2023/09/auto-fullwidth/

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I mentioned a simple CSS trick to generate
full-width figures in 2021. I was thinking the other day if I could make
certainly automatic elements, so I do not need to manually specify them to be
full-width. Finally, I wrote some JS
code to deal with
three types of elements automatically:

  1. Code blocks ( <pre><code> ).

    If the scrollWidth is greater than offsetWidth , it means the code block
    has a horizontal scrollbar, and we may want to make it full-width.

  2. Tables ( <table> ).

    If its offsetWidth is greater than its parent’s offsetWidth , it is too
    wide.

  3. Table of contents (an element that has the ID TableOfContents , eg,
    <nav id="TableOfContents"> ).

    If any TOC item has multiple rectangles on the layout
    ( getClientRects().length > 1 ), it means the item is wrapped, and the TOC
    may benefit from more space.

The JS code will add a class name fullwidth to elements that need more space.
Users can define CSS rules for this class, eg,

 .fullwidth { width: 100vw; margin-left: calc(50% - 50vw); }

On my website, I do not really use the full screen width, but only the body
width. It’s up to you how wide you want your .fullwidth elements to be. You
can load the JS from the jsdelivr CDN:

 <script src="https://cdn.jsdelivr.net/npm/@xiee/utils/js/fullwidth.min.js" defer></script>

The above code block is also an example of an automatic full-width element. If
you view it on a large screen such as your computer screen, it should take the
full body width.

This article is reproduced from: https://yihui.org/en/2023/09/auto-fullwidth/
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