HTML iframes : Java Glossary

iframes

Iframes are like Windows into which you can pour an entire separate document. They may optionally have scrolling. They are not universally supported and are not permitted in strict DTDs. The latest Opera, Firefox, Sea Monkey, Netscape and IE all support them. There are typically used to contain ads, such as the one on the right: Here is the code to generate it:

For some reason you must use a separate </iframe> tag. You can’t say <iframe … />.

The Referenced Snippet

The html you insert into the frame must be a complete web page, not just a fragment. It needs a minimal header with at least this much:

Iframe Tags
Attribute	Value	Description
align	left right top middle bottom	Specifies how to align the entire iframe relative to the surrounding text.
frameborder	1 0	Specifies whether or not to display a frame border.
height	pixels %	Defines the height of the iframe. Includes the height of the horizontal scroll bar if any. It also must include room for padding and margins around the components enclosed. Oddly, even when you have scrolling=no you must still include room for the horizontal scroll bar. The display will be not as tall as you request. This way you can add or remove scrolling without changing the size of the payload window. You specify the size of the window including the possibly invisible scroll bars. If you leave this out, the browser will pick something, which may or may not be reasonable.
longdesc	URL	An URL to a long description of the frame contents, not the long description itself.
marginheight	pixels	Defines the top and bottom margins of the iframe.
marginwidth	pixels	Defines the left and right margins of the iframe.
name	frame_name	Specifies a unique name, within the page, of the iframe (to use in scripts).
scrolling	yes no auto	Define scroll bars. I found that when you scroll the coloured background is only as big as in the initial window. I could not get backgrounds to work properly and eventually used a transparent background to mask the error. Opera will let you scroll without scroll bars even if you specify scroll="no". Firefox will not.
src	URL	The URL of the document to show in the iframe.
width	pixels %	Defines the width of the iframe. Includes the width of the vertical scroll bar if any. It also must include room for padding and margins around the components enclosed. If you leave this out, the browser will pick something, which may or may not be reasonable.

I have found that classes applied to an iframe are ignored. So I put the whole <iframe …>…</iframe> in a <div class="iframe">…</div > sandwich to give me a handle to control the iframe’s properties. Life gets complicated with the Russian dolls of nested containers. You will just have to experiment to get the effects you want.

CSS
FORMS
FORMS: specification
HTML 4.01 Specifications: current HTML Standard
HTML Cheat Sheet

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