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I must say I'm pleasantly surprised with Hey.com's HTML emails support. They use an <iframe> to embed emails, a safe list for HTML tags and attributes (no form or input), and close to nothing for CSS (so yes, pretty much every style ever is supported). #emailgeeks
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My biggest complaint is the lack of support for
roleand other ARIA attributes. Email developers use <table>s to cope with Outlook's rendering engine. So we rely on these attributes to make HTML emails more accessible. -
Another quirk is that
font-sizevalues are changed. For example,font-size:32px;becomesfont-size:calc(32px / var(--scale-factor)). Unfortunately this also applies to keywords, sofont-size:inherit;becomesfont-size:calc(inherit / var(--scale-factor)), making it dull.
