The post title is 'Document Type Declarations in HTML5'. Below is a preview of
the post.
Document type declaration is needed at the top of each web page in HTML5.
Without specifying a 'doctype', your HTML just isn't valid HTML and most
browsers viewing them will switch to 'quirks mode', which means that they
won't understand the document and hence perform any random operation. The
document declaration for HTML5 looks like this:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0
Strict//EN" "http://www.google.com/TR/xhtml1/DTD/xhtml1-strict.dtd">
Two most important elements to be mentioned in document type declaration are
language and content types. You should identify the primary language of a
document either through an HTTP header or with the xml:lang attribute inside
the opening html tag. Although this is not necessary to produce a valid HMTL
document, it is an accessibility consideration. The value is an abbreviation,
such as 'en' (English), 'fr' (French), 'de' (German) or 'mg' (Malagasy).
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