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The name of the user-defined configuration file is arbitrary and must be stored in the same directory like custom.js.
You can add multiple files as the following example.
Example 1
<p stylh1. "border-left:2px solid SteelBlue;padding-left:8px;">
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You can extend the example with using _extra_urls.
Example 2
<p style"border-left:2px solid SteelBlue;padding-left:8px;">
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