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<!-- absolute file path -->
<a href="https://developer.mozilla.org/en-US/docs/Web">The URL for this anchor element is an absolute file path.</a>
<!-- relative file path -->
<a href="./about.html">The URL for this anchor element is a relative file path.</a>
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/ = Root directory
. = This location
.. = Up a directory
./ = Current directory
../ = Parent of current directory
../../ = Two directories backwards