How to make sure that the cursor does not go to the very beginning?

Question

HTML

There is this block:

<div contenteditable class="text code-text" oninput="syntax();">print("Hello, world!")</div>

Syntax function:

function syntax () {
    // .....
    // codeText - Элемент с классом code-text
    // _code - Изменённый код
    codeText.innerHTML = _code;
}

After the function has worked, the cursor goes to the beginning, and since this happens with every oninput, it is impossible to write code.
How to make sure that the cursor does not go to the beginning?
UPD1:

Answer 1

https://stackoverflow.com/questions/8236427/save-r...