I am developing email responsive templates , when i developing templates shall i use colspan? it will support all desktop email clients as well mobile clients? please suggested to me, it will support or not?
2 Answers
I can't find a source that explicitly states it's supprt, but yes I do believe that all email clients support the colspan
attribute. It's a very old and basic part of HTML that is still widely used and supported by all browsers, so it's safe to assume that any email client that handles HTML also knows about colspans.
In addition I didn't find it in any of the lists of "Improvements recommended" for the email clients on this page, which can be a great resource: email-standards.org
Sites like this one and this also note that you should use tables, and don't list colspan
as something that should be avoided.

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Yes colspan works on all email clients if setup properly. This thread may be helpful - it addresses a quirk in Outlook.
I would be cautious using multiple columns in responsive templates though. If you want something to bump down to the next line, or hide on resizing for mobile, then colspans are probably the wrong approach. A colspan cell row won't un-colspan itself, which could be problematic if you are after a single stack for mobile.