Given
it’s possible to place a caret in the first line and shift+end to select from caret till the end of doc.
But it’s not possible to go selecting letter-by-letter (using shift+RrightArrow) or word-by-word (using shift+Alt+RrightArrow). It should be possible. And element should behave like a letter (one press to select it all), but also like a word (one press to select it all too).