I have a huge TOC, over 100 entries, and I think a multi-column approach would be very helpful.
Yes, I really need that huge TOC (generated by computer code). Here is a sample of the code I currently use:
<h1 id="toc">Table of Contents</h1>
<p class="tocnt"><a href="#001">Chapter 1</a></p>
<p class="tocnt"><a href="#002">Chapter 2</a></p>
Here is a segment from the CSS:
What HTML and CSS can I use to produce a 3 column Table of Contents? I can modify my computer program to generate the new code.
There are several ways to do it in CSS (with increasing complexity: "float: left", "display: table-cell" or "display: grid").
One important aspect is to avoid usability problems on mobile screens (like horizontal scrolling). When using floats, the columns will rearrange themselves below each other automatically in narrow viewports. Using the other ideas above, you may use CSS Media Queries to apply a completely different CSS layout in a narrow viewport.
float: left sounds promising. I will try to find out more about it. I may end up having to ask more details, but I will try to research it first.
Here's a good tutorial on floats: https://css-tricks.com/all-about-floats/ (though it doesn't focus on multi column layouts in particular).
The column-count property specifies the number of columns an element should be divided into.
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