[html] handle HTML-escaped characters in JavaScript attribute properties

[n1ckoates]

Issue Type: Bug

• Create an HTML attribute with JS in it, such as a button onclick event.

• Since attributes cannot use raw double quotes (Already used to open/close the attribute, HTML will give a syntax error), use ".

• VSC will incorrectly mark it as an error

Example <button onclick="someFunction(&quot;string&quot;);">

VS Code version: Code 1.51.1 (e5a624b788d92b8d34d1392e4c4d9789406efe8f, 2020-11-10T23:34:32.027Z) OS version: Windows_NT x64 10.0.18363

System Info

|Item|Value| |---|---| |CPUs|Intel(R) Core(TM) i5-9400F CPU @ 2.90GHz (6 x 2904)| |GPU Status|2d_canvas: enabled
flash_3d: enabled
flash_stage3d: enabled
flash_stage3d_baseline: enabled
gpu_compositing: enabled
multiple_raster_threads: enabled_on
oop_rasterization: disabled_off
opengl: enabled_on
protected_video_decode: unavailable_off
rasterization: enabled
skia_renderer: disabled_off_ok
video_decode: enabled
vulkan: disabled_off
webgl: enabled
webgl2: enabled| |Load (avg)|undefined| |Memory (System)|15.93GB (10.94GB free)| |Process Argv|--crash-reporter-id 7653d454-ecf1-40e5-ad93-80b2e56cc4b5| |Screen Reader|no| |VM|67%|

Extensions (6)

Extension|Author (truncated)|Version ---|---|--- vscode-eslint|dba|2.1.13 denizenscript|den|0.3.5 prettier-vscode|esb|5.8.0 discord-vscode|icr|4.0.0 python|ms-|2020.11.371526539 jupyter|ms-|2020.11.392013122

[n1ckoates]

Sorry, I accidentally hit the close button. GitHub's mobile app is a bit confusing 😅

[dhpwd]

Any update on this? It's still an issue...