document.getElementById() - Web APIs | MDN
https://devdoc.net/web/developer.mozilla.org/en-US/docs/Web/API/document.getElementById.html
Jul 24, 2017 · When creating an element and assigning it an ID, you have to insert the element into the document tree with Node.insertBefore() or a similar method before you can access it with getElementById(): var element = document.createElement('div'); element.id = 'testqq'; var el = document.getElementById('testqq'); // el will be null!
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