querySelector vs getElementById

Get Element By Id

• It returns a node list which is live, meaning if you add or remove any element from the DOM the node list will update
• It is faster relative to the query selector methods

Query Selector

• It returns a node list which was available at the time of the execution

Also Read:

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2. Testing promise sequence using mocha, chai, chai-as-promised, sinon
3. Using es6 modules with simple examples
4. window.onload vs document.onload
5. imperative vs declarative/functional programming