HTML and CSS Reference
In-Depth Information
Page Head Information
Now that you have seen some of the interesting things that can go in an
HTML document's body, it is time to learn what else is in its head. Here are a
few facts about head elements to guide your understanding:
. Head elements are a mixed bag of diferent tags, many of which do
. he title element is required. All other head elements are optional.
. Head elements are rarely nested inside each other. Most are self-closing.
. HTML comments can go in the document head. hey are always useful.
. he order of elements in the head generally does not matter.
Ordering does matter with style and script elements in that later CSS rules
can override earlier ones, and a JavaScript function deined with a given name
replaces any earlier deined function that has the same name. But it does not
matter if style elements are placed before script elements or vice versa.
meta elementS
he meta element, or tag, represents various kinds of information about a
document that cannot be expressed using the title or other elements. The
meta element has three diferent uses, depending on which of the three follow-
ing attributes is present in the self-closing tag: name , http-equiv , or charset .
Only one of these attributes can be present in a meta element.
If either the name or http-equiv attribute is present, the content attribute
must also be present. Without content attributes, these meta elements have no
reason to exist. he charset attribute speciies the character encoding to apply
to the document's data. A document should have only one meta element with a
charset attribute. Here's an example:
<meta charset="utf-8"/>
meta elements with name attributes say things about a document. Each such
meta element deines one item of data expressed as a name/value pair using the
name and content attributes, respectively. For example:
<meta name="author" content="Murasaki Shikibu"/>
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