} Currently when I want to study the construction of a web page,
} I use view source.
} I'm looking for some a little more high-tech.
You want Firefox with some handy extensions:
Tamper Data: https://addons.mozilla.org/firefox/966/
View Source Chart: https://addons.mozilla.org/firefox/655/
Web Developer: http://chrispederick.com/work/webdeveloper/
Others I haven't tried but look useful:
View Dependencies: https://addons.mozilla.org/firefox/2214/
} any images.
View Dependencies may help with this. Also, Firefox has an option to save a
web page as "Web page, complete" which includes all external references.
} is this td element affected by any .css?
InspectThis lets you bring up the DOM inspector (which is, I think, an
optional install with Firefox).
} Is there any .css that is not used in this page?
I'm not sure what you mean by this. You're looking for CSS code that
doesn't apply to any elements in the page? I don't know of a way to do
that. You can use EditCSS to mess with the CSS and see what changes,
There used to be an extension named Event Spy, but it seems to be gone. For
now, Firebug can help, in conjunction with the DOM inspector.
} What does the hierarchy of HTML elements look like?
View Source Chart is excellent for this, as is the DOM inspector and
InspectThis. Firebug's Inspector tab can also be useful. In addition, Web
Developer will let you outline a variety of kinds of HTML elements. That
savegenpage extension may also be helpful, since I believe it will allow
you to view the source of a page as it is after it has been attacked by
AJAX and such.
} What are the hidden parameters of a form?
Tamper Data is excellent for that, allowing you to stop in mid-submit and
see what is being submitted. Of course, you can also just view source and
find all inputs of type hidden.