https://lynxjs.org/api/elements/built-in/text.html#setTextSelection

This method sets the selected text based on start and end positions and controls the visibility of selection handles. The response res contains:

data Action = SetText | TextSet | SetTextError MisoString

update :: Action -> Effect props model Action
update = \case
  SetText -> setTextSelection "someImageId" SetText SetTextError
  TextSet -> io_ (consoleLog "text was set")
  SetTextError e -> io_ (consoleLog e)

https://lynxjs.org/api/elements/built-in/text.html#gettextboundingrect

This method retrieves the bounding box of a specific range of text.

data Action = RectReceived Rect | GetRect | GotError MisoString

update :: Action -> Effect props model Action
update = \case
  GetRect -> getTextBoundingRect "#box" defaultGetTextBoundingRect RectReceived GotError
  RectReceived rect -> io_ $ consoleLog ("got rect")
  GotError errMsg -> io_ (consoleLog errMsg)

https://lynxjs.org/api/elements/built-in/text.html#getselectedtext

This method retrieves the string content of the currently selected text.

data Action = TextReceived MisoString | GetText | GotError MisoString

update :: Action -> Effect props model Action
update = \case
  GetText -> getSelectedText "#box" TextReceived GotError
  TextReceived txt -> io_ (consoleLog ("got text: " <> txt))
  GotError errMsg -> io_ (consoleLog errMsg)