Styles stripped when using setSignatureAsync on Outlook Mobile about office-js

[AlexJerabek]

Hi @bogdanst24,

Thanks for reporting this. @exextoc, could you please investigate?

[kumarshrey-msft]

@bogdanst24 Thanks for reporting this, it's a known issue that few HTML attributes are sanitized by Outlook Mobile's editor. In the meantime to get unblocked, can you try using CSS properties to achieve the desired style? The allowed HTML attributes and sanitized values of a few are documented here.

[bogdanst24]

There are known CSS alternatives for cellspacing (using border-collapse:collapse) and cellpadding (using padding:0 on ), but they do not work on Outlook Desktop :(.
A known issue as in a bug already in the backlog, or a known limitation?

[kumarshrey-msft]

We have noted your concern regarding CSS alternatives not working on Classic Outlook Desktop and are having internal discussion regarding the best developer experience here. However, the general guidance remains to prefer CSS over HTML attributes to avoid the editor sanitization which might happen across the other clients.

In the meantime, for this immediate issue, can you try using Office.Diagnostics to check for the platform and apply CSS or HTML attributes accordingly?

[bogdanst24]

We would prefer not to start doing that, as it looks like the rendering engines and in general email client products are continuously changing. Also, there are no official guidelines on what and how to change. Doing it based on findings from the internet and some local testing is not a good thing for an enterprise product.