sanitize url attributes case-insensitively#21479
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sanitizeAttributeValue compares the attribute name against the bad-attribute lists with exact case, but normalizeProperty hands back the camelCased DOM property name (formAction) when a template writes the attribute that way, so a bound javascript:/vbscript:/data: url on something like skips the protocol check that the lowercase formaction spelling gets and reaches the element unprefixed. Lower-casing the attribute in checkURI/checkDataURI/checkDataProtocol marks the same value unsafe regardless of casing, matching how the tag name is already normalized.