Written in
You can run the following code to try
<!--you run the following code to see-->And if it's written in <body>, and it's written in HTML, then because the body is executed from the top down and loaded to where the execution will result in JS value is null or undefined As a result, methods cannot be used for example below<! DOCTYPE html>
If you want to make it useful there are two ways to do this is to put JS below and there is a look like the following<! DOCTYPE html>
This can also be used, but I do not think it is necessary to write JS below or write in
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