It is likely a problem with how the extension is built/packaged as the same extension in vscode from open-vsx also does not have embedded support.
Example Videos
_vscode (confirmed with all extensions disabled):_
https://user-images.githubusercontent.com/40359487/137733178-bb2dcff5-bfe6-416d-9313-badb7b788c0a.mp4
_theia (confirmed with v1.50.0):_
https://user-images.githubusercontent.com/40359487/137733190-b8a6242b-c054-4746-9d0e-ab1dd6deccd2.mp4
Description
Follow-up from https://github.com/eclipse-theia/vscode-builtin-extensions/issues/35, it seems as though the packaging of
html-language-featuresdoes not work well as embedded JS/TS support is non-existent (ex: quick suggestions).It is likely a problem with how the extension is built/packaged as the same extension in vscode from open-vsx also does not have embedded support.
Example Videos
_vscode (confirmed with all extensions disabled):_ https://user-images.githubusercontent.com/40359487/137733178-bb2dcff5-bfe6-416d-9313-badb7b788c0a.mp4 _theia (confirmed with v1.50.0):_ https://user-images.githubusercontent.com/40359487/137733190-b8a6242b-c054-4746-9d0e-ab1dd6deccd2.mp4