There are only two distinct ways in which this script can be used; either as an external or internal script. An external script means the web developer stores the script language in a separate file then the HTML pages will access this file whenever required. On the other hand, an internal script means the web developer prefers to store the script files within the HTML document itself.
To prevent this from happening, the web developer thus introduces HTML comments around the script to hide it from older browsers or HTML pages.
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