Ballpark guess - less than 5 years. There is the work ongoing on CSS and HTM modules at: https://github.com/WICG/webcomponents/blob/gh-pages/proposals/css-modu

Ballpark guess - less than 5 years. There is the work ongoing on CSS and HTM modules at: https://github.com/WICG/webcomponents/blob/gh-pages/proposals/css-modules-v1-explainer.md https://github.com/WICG/webcomponents/blob/gh-pages/proposal... https://github.com/WICG/webcomponents/blob/gh-pages/proposals/html-modules-explainer.md https://github.com/WICG/webcomponents/blob/gh-pages/proposal...