Is calc() supported in html email?

Question

caniuse.com shows calc() can be used today in all modern browsers except Opera. But how good is the support for calc() in email clients?

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Answer 1

Desktop Outlook for Windows has abyssmal HTML email support, its level of CSS compliance is poor and stuck in ~2001-era CSS 2.1 support. I don't believe it supports any CSS3 features (selectors nor properties). This is because it uses Word's layout engine. So calc support is definitely not there - and unfortunately desktop Outlook happens to be the most popular desktop e-mail client.

For this reason, I don't recommend HTML emails contain any advanced features and should only be a lead-in with a link to an actual live webpage that contains the features and functionality you want to show users.