Aria Landmarks

That depends on the theme you are using. It provides this code.

You can usually customize it via a child theme: https://developer.wordpress.org/themes/advanced-topics/child-themes/

If you want to know exactly how to do this with the theme you are using, please contact its support forum.

I must not have read that correctly yesterday. When it comes to FSE themes, it’s unfortunately a bit more complicated.

First of all, the elements you want to change are template parts. These are an integral part of the Site Editor and can be assigned to the header or footer area, for example, to mark them as such.

The HTML code for these elements is dynamically composed here depending on properties: https://github.com/WordPress/WordPress/blob/master/wp-includes/blocks/template-part.php#L177

Unfortunately, it is currently not possible to add your own individual attributes at this point. What’s more, there has been an open issue since 2023 regarding your exact concern in the Gutenberg team: https://github.com/WordPress/gutenberg/issues/46002

In my opinion, you therefore have only two options:

• You join the above-mentioned open issue. This may give it a little more importance, so that developers will look at it for the next updates. You would have to wait until something happens here.
• Or you can adjust the output of the HTML code using the trick below.

The trick: you can cache the entire HTML code to be output, adjust it before output, and then output it. To be honest, for me this is the very last option for adjusting the HTML code to be output, as it seems more like a “sledgehammer method.” The procedure for this is roughly as shown here: https://gist.github.com/vielhuber/09c7818a30cca1085c5c4ef7bb55d93a – however, in your case, you would have to replace <header class="wp-block-template-part"> with <headerclass="wp-block-template-part"role="banner"> exactly. I haven’t tested this yet, so I can’t provide any complete code atm. But that would be the last resort for now.