CSS has two new positional alignment keywords as part of CSS Box Alignment Level 3: flow-start and flow-end. These are defined as aliases for the existing flex-start and flex-end keywords.

There are a few scenarios where we might need to change the level of a heading (–). As an example, we create a component with a , but then we use the component in a different context where it needs to be a . I know, I know, that’s what component props are for, but the headingoffset HTML attribute is another option.

Another example: the heading hierarchy is wrong, but we don’t have full control over the HTML. headingoffset might be able to fix that too, depending on the HTML that we do have access to.

Firefox Nightly 153 shipped headingoffset behind the dom.headingoffset.enabled flag, so we’re a way off, and it isn’t really usable until all web browsers support it, but it’s well worth a look now.

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