Taint mode does not help against null bytes (or any other bytes) in your read_file "$page.html" example. Reads are not checked for tainted data. Writes are though, so write_file "$page.html" would've been stopped by the -T switch.
In short, I'd like to add this: Don't think -T will do the job for you! Just think it may help you if you slipped up.
See perltoc if you don't know which perldoc to read!
Read argumentation in its context!
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