Parses the HTML (htmlparser2) and its CSS (postcss for <style> blocks, own parse...
https://bild.halowerk.com/v1/email-html-compatOverview
Parses the HTML (htmlparser2) and its CSS (postcss for <style> blocks, own parser for style attributes, css-what for selectors) and maps what it finds to 304 of the 306 detectable caniemail features: elements and attributes, input and button types, mailto and anchor links, comments and doctype, CSS properties and selected values (display:flex/grid/none, flex-direction:column, system-ui fonts), at-rules and media features (prefers-color-scheme and others), selector types and combinators…