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11.6 Inline Frames
To
this point, our discussion has centered around frames that are
defined as part of a frameset. A frameset, in turn, replaces the
conventional <body> of a document and
supplies content to the user via its contained frames.
The HTML 4 and XHTML standards let you do things a bit differently:
you can also define a frame that exists within a conventional
document, displayed as part of that document's text
flow. These frames behave a lot like inline images, which is why they
are known as inline frames.
Internet Explorer Versions 4 and later and Netscape Version 6 support
inline frames.
11.6.1 The <iframe> Tag
Define
an inline frame with the <iframe> tag. The
<iframe> tag is not
used within a <frameset> tag. Instead, it
appears anywhere in your document that an
<img> tag might appear. The
<iframe> tag defines a rectangular region
within the document in which the browser displays a separate
document, including scrollbars and borders.
<iframe>Function: Defines an inline frame within a text flow Attributes: align, class, frameborder, height, id, longdesc, marginheight, marginwidth, name, scrolling, src, style, title, width End tag: </iframe>; never omitted Contains: body_content Used in: text |
<iframe> to specify the URL of the document
that occupies the inline frame. All of the other, optional attributes
for the <iframe> tag, including
name, class,
frameborder, id,
longdesc, marginheight,
marginwidth, name,
scrolling, style, and
title, behave exactly like the corresponding
attributes for the <frame> tag. [Section 11.4.1]
Use the content of the <iframe> tag to
provide information to users of browsers that do not support inline
frames. Compliant browsers ignore these contents, whereas all other
browsers ignore the <iframe> tag and
therefore display its contents as though they were regular body
content. For instance, use the <iframe>
content to explain to users what they are missing:
...other document content...
<iframe src=" width=75 height=200 align=right>
Your browser does not support inline frames. To view this
<a href=">document</a> correctly, you'll need
a copy of Internet Explorer or the latest Netscape Navigator.
</iframe>
...subsequent document content...
In this example, we let the user know that she was accessing an
unsupported feature and provided a link to the missing content.
11.6.1.1 The align attribute
Like the
align
attribute for the <table> tag, this inline
frame attribute lets you control where the frame gets placed in line
with the adjacent text or moved to the edge of the document, allowing
text to flow around the frame.
For inline alignment, use top,
middle, or bottom as the value
of this attribute. The frame is aligned with the top, middle, or
bottom of the adjacent text, respectively. To allow text to flow
around the inline frame, use the left or
right values for this attribute. The frame is
moved to the left or right edge of the text flow, respectively, and
the remaining content of the document is flowed around the frame. A
value of center places the inline frame in the
middle of the display, with text flowing above and below.
11.6.1.2 The height and width attributes
Internet
Explorer and Netscape 6 put the contents of an inline frame into a
predefined, 150-pixel-tall, 300-pixel-wide box. Use the
height and width attributes
with values as the number of pixels to change those
dimensions.
11.6.2 Using Inline Frames
Although you'll probably shy away from them for most
of your web pages (at least until most browsers become fully
standards-compliant), inline frames can be useful, particulary for
providing information related to the current document being viewed,
similar to the sidebar articles you find in a conventional printed
publication.
Except for their location within conventional document content,
inline frames are treated exactly like regular frames. You can load
other documents into the inline frame using its name (see the next
section) and link to other documents from within the inline
frame.
