rrweb-cssom
CSS Object Model implementation and CSS parser
css.escape
A robust polyfill for the `CSS.escape` utility method as defined in CSSOM.
cssom
CSS Object Model implementation and CSS parser
mq-polyfill
CSSOM-valid and jsdom/Jest-compatible matchMedia polyfill for server-side unit tests
get-css-data
A micro-library for collecting stylesheet data from link and style nodes