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I was under the impression that alt text was meant to be used to describe the image, not what it's being used for. Unless that's different in the context of section break, I'd think using an image's alt text that way wouldn't be a best practice--and of course these also aren't section breaks.
I don't think there is a particularly good solution, because I can't think of any tag that describes something like a timing/pacing beat. For the most part I would think this would be mostly suggested by the content itself, though it's tough to say in this case without an example. But if there's no tag for it, there's no tag for it--and then you're just left to choose from an array of options that are all unsemantic in some way or another, including what you were already doing via CSS.
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