Found some more code examples and am now able to either add a new formatting button that will trigger a completely inaccessible “href” popover but otherwise sorta works, or replace the core link button with something that, uh, will add an `a` tag with a class. But I’m a React noob. Plus, _all_ we need is for core links to accept a class.
@nathand Custom blocks, patterns, or variations could be very handy, too, but the one thing I would really like is a way to easily address _inline_ links, e.g., those inside a paragraph block. (You’d pretty much have to create your own `Format`, i.e., what Yoast does.) One thing I could probably do, tho, is just add a class to the parent block and then let the `the_content` filter, i.e., PHP, handle the rest.
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