wonder why put Copy-Paste in drop down list in HTML5 mode.
isn't Ctrl+C / Ctrl +V enough for that if u're in browser, unless u're stuck with a touchscreen
seems like you (Developers) forgot to fix the text editing in HTML5 browser mode these shortcuts works in Flash mode.
Ctrl + Shift + ⬅ =
Ctrl + Shift + ➡ =
Ctrl + Backspace=
Ctrl + Delete =
Although works to some extent
Ctrl + Shift + Home = ✔ (only selects the whole line)
Ctrl + Shift + End = ✔(only selects the whole line)
Ctrl + Home = ✔ (only moves the cursor to the front of the line)
Ctrl + End = ✔ (only moves the cursor to the front of the line)
Shift + ⬇ or ⬆ = ✔ (this works)
Shift + ⬅ or ➡ = ✔ (this works)