4.4. Frame Targets
The <frame> tag includes an attribute that allows you to name the frame. A hypertext link in another frame can load its referenced document into the named frame by using the target attribute in the <a> tag. For example:
<frame src="frame.html" name="display_frame">
describes a frame that displays frame.html and is named display_frame. If another frame or window (or even the same frame) contains this link:
<a href="file.html" target="display_frame">
and this link is selected, the file file.html replaces the file frame.html in the frame named display_frame. This is the basic use of targeting frames. A useful example is a book with a table of contents. The table of contents is loaded into a frame that occupies a narrow column on the left side of the browser window. The table of contents contains a list of links to each chapter in the book. Each chapter link targets the frame that occupies the rest of the window. You can then view the chapters while keeping the table of contents available for further navigation.
It can be tedious to specify a target for every hyperlink in your documents, especially when most are targeted at the same window or frame. To alleviate this problem, you can use the target attribute for the <base> tag in the <head> of your document. Adding a target to the <base> tag sets the default target for every hypertext link in the document that does not contain an explicit target attribute.
There are a couple of things to note about the use of targets and named frames:
Four reserved target names for special document redirection actions are listed below. They all begin with the underscore ( _ ) character. You should not use the underscore character as the first letter of any name that you assign a frame, as it will be ignored by the browser.
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