What standard/RFC does this site pull from? The list of features a client is exp...

edoceo · on May 11, 2021

Its arbitrary cause there is no RFC about the ah-hoc choices email client softwares have made over the years that have kinda become de facto "standards"

Forge36 · on May 11, 2021

https://github.com/hteumeuleu/caniemail

This is specifically focused at HTML specs/features, and a fork of https://github.com/Fyrd/caniuse

Targeting HTML rendering engines which are email clients.

Fortunately (at least for some of the newer features to be included) Links to MDN are available, and caniuse both link to we spec). CSS min for example is working draft. https://www.w3.org/TR/css-values-4/#math-function

With 90% desktop/mobile browser general usage support, 50% email usage support.

azernik · on May 11, 2021

AFAIU this is a fork of caniuse.com; the features it tracks are probably a strict subset of those.

The feature definitions seem to be maintained manually, at https://github.com/hteumeuleu/caniemail/tree/master/_feature... assuming it follows the caniuse.com community model, information about supported browsers is similarly crowdsourced.