On 21 Mar 2019, at 5:32, Pedro David Marco wrote:

Hi...

Any idea about how to detect white text over white background in HTML?


# grep -rC2 font_low_contrast /var/spamassassin/3.004002/updates_spamassassin_org
        /var/spamassassin/3.004002/updates_spamassassin_org/20_html_tests.cf-
        /var/spamassassin/3.004002/updates_spamassassin_org/20_html_tests.cf-
/var/spamassassin/3.004002/updates_spamassassin_org/20_html_tests.cf:body HTML_FONT_LOW_CONTRAST eval:html_test('font_low_contrast') /var/spamassassin/3.004002/updates_spamassassin_org/20_html_tests.cf-describe HTML_FONT_LOW_CONTRAST HTML font color similar or identical to background
        /var/spamassassin/3.004002/updates_spamassassin_org/20_html_tests.cf-


A quick peek at the code in Mail/SpamAssassin/HTML.pm shows that Mail::SpamAssassin::HTML{'font_low_contrast'} is set to '1' if the foreground and background colors are close or identical.

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