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The mobileOK Checker parses the page under test as HTML no matter what, even when content is served as binary or is an SVG page served as image/svg+xml. The report should make it clear that this is the case, and explains the rationale behind this (i.e. that the mobileOK Checker behaves as a basic mobile device that only supports XHTML Basic 1.1, and thus is very limited). Also make it clear (with a global warning perhaps?) that the report is basically useless when the page is not an HTML page. Sure enough, SVG content does not start with "html". Bug triggered by: http://lists.w3.org/Archives/Public/public-mobile-dev/2010Sep/0000.html