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Editorial Team
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Asked: 2026-06-04T18:02:08+00:00

It looks like Firefox is treating it like an error. What does this mean?

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It looks like Firefox is treating it like an error. What does this mean?

enter image description here

Firefox treats it normally if I change it to:

<!DOCTYPE html>
<html>

BTW I’m on Firefox 12.0

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1 Answer

  1. Editorial Team

    If you hover over that red line, Firefox gives you the answer.

    Almost standards mode doctype. Expected “<!DOCTYPE html>”

    The markup of the View Source also hints its an error doctype

    <span class="error doctype" title="Almost standards mode doctype. Expected “<!DOCTYPE html>”.">
    &lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt;
</span>

    The point is, Firefox wants <!DOCTYPE html> as the standard mode doc-type.

    Update:

    Excerpt from the above given link.

    The DOCTYPE shown in the example, <!DOCTYPE html>, is the simplest
    possible, and the one recommended by HTML5. Earlier versions of the
    HTML standard recommended other variants, but all existing browsers
    today will use full standards mode for this DOCTYPE, even the dated
    Internet Explorer 6    . There are no valid reasons to use a more
    complicated DOCTYPE. If you do use another DOCTYPE, you may risk
    choosing one, which triggers almost standards mode or quirks mode.

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