Siteimprove will flag the use of the <u> element. Will it flag the use if the <u> element has explicit text-decoration: underline; CSS instead of relying on the user stylesheet to default to it?

Adding style="text-decoration: underline;" to the element doesn't help, applying the style to a <span> works.

How does Siteimprove feel about the <s> element for strikethroughs? MDN suggests using <del> instead.