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Let’s focus on styling lists here, mostly just ordered and unordered lists (with apologies for snubbing our friend the definition list), and somewhat unusual styling situations.
Before you do anything too fancy, know that there is quite few settings for list-style-type that might cover your needs out of the gate.
Ordered lists can start at any number you want them to.
A single reversed attribute will do the trick.
The best bet is using a background-image on a pseudo-element. You’d think list-style-image would be the way to go, but it’s extremely limited. For example, you can’t position it or even resize it.
The value attribute will set a list item to use the marker relevant for that position.
Can be done with pseudo-elements for the most control, but there is also list-style-type: '-';
Things line up nicer with list-style-position: outside; (the default value), but the list markers render outside the box, so you have to be careful not to cut them off. They could hang off the edge of the browser window, or overflow: hidden; will hide them completely. The last two examples here have a trick to mimic the nicer alignment while rendering inside the element.
Three ways here:
::marker (newest and easiest)background-image (this one is an SVG Data URL so you can manipulate the color from the CSS)The number of columns can be automatic.
One-offs can be done with list-style: symbols() and reusable sets can be made with @counter-style then used. Note this is only supported in Firefox at the time of writing.
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