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doctype
The <!DOCTYPE> declaration is needed and HTML5 is recommended. If not found or found not HTML5, it reports.
<!DOCTYPE>
<!-- Bad --> <html lang="zh-CN"> ... </html> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//en" "http://www.w3. org/TR/html4/strict.dtd"> <html lang="zh-CN"> ... </html> <!-- Good --> <!DOCTYPE html> <html lang="zh-CN"> ... </html>
009
The <!DOCTYPE> declaration is not found.
041
The <!DOCTYPE> declaration is found not HTML5.
true
Do check / format.
false
Do not check / format.
Yes.
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