What are the most significant benefits of the EditContext API compared to hidden textarea ?

I am a developer of a rich text editor engine.
I would like to know more about the advantages of EditContext API compared to contenteditable or hidden textarea.

I know that using contenteditable directly on the DOM to implement a rich text editor can lead to inconsistent data and unpredictable behavior.
So I now use a hidden textarea. I get user input by listening to beforeinput, compositionstart/compositionend and update my own text model and selection model, then render them. At the same time, by modifying the position of the textarea element, I make the IME window appear in the appropriate position.
Even when I use canvas to implement 3D art text input, I can also receive input text through a hidden textarea and then render it on the canvas.

So as of now, I'm not sure what significant benefits the EditContext API can bring me compared to hidden textarea?

Read the EditContext API materials alongside the issue's comparison points: contenteditable, hidden textarea, beforeinput, composition events, IME positioning, and canvas text input. Document the significant practical differences and benefits for rich text editors, and make clear when EditContext is preferable to the described hidden-textarea approach.