The image below uses src="images/rel-ok.png" (relative). Correct resolution against this page's directory is /subdir/images/rel-ok.png (exists, 200). A resolver that wrongly uses the domain root as base would produce /images/rel-ok.png (does not exist, 404) and report a false broken resource. Regression fixture for crawler.pl extract_image_info base URL (b2bbrunchburger case, Sep 2026).
