Given the following HTML

<!DOCTYPE html>
<html>
<del style="background:#ffe6e6;">Workrite Sit to Stand Solace Stealth Standing Desk – Black</del><ins style="background:#e6ffe6;">NA</ins>

</body>
</html>

I'd expect this to look like the first part in pink background with a strikethrough, the last part (NA) underlined with a mint green background. but If I load into a WPRichText, I just get:

Workrite Sit to Stand Solace Stealth Standing Desk – BlackNA

Is there a setting to make it respect the ins and del tags and also the "background" ?