KiwiBrian said:
Is there a program, application, or utility, that I can point at an HTML
file and will produce a list of dependant files used by both the HTML and
CSS files?
Not very reliably, no.
Wget for example will let you download an HTML file and it's
"prerequisites" (linked images, etc), but you'd often need a very
intelligent piece for software to be able to calculate everything that a
page requires!
For example:
<html>
<title>Example</title>
<script type="text/javascript">
for (var i=0; i<10; i++) {
document.write("<img src=\"img" + i + ".jpeg\" alt=\"Image " + i + "\"><br>");
}
</script>
</html>
This page requires files img0.jpeg to img9.jpeg to load, but your program
would have to understand and run the Javascript to know that!