Safari seems to use AXTitleUIElement in a couple places not mentioned in the HTML-AAM, if I'm reading the code correctly:

• Used to associate a <figcaption> with its <figure>
• Used to associate a <label> with its form control
• Used to associate a <legend> with its <fieldset>

Should this be called out in the HTML-AAM? For example, in the <figure> mapping? It would make the mapping more similar to the aria-labelledby AX mapping in the Core-AAM, too.