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- <title>HTML Extensions</title>
- <body>
-
- <h1>ArcWeb's HTML Extensions</h1>
-
- ArcWeb contains a few HTML extensions to support the RISC OS environment.
- These include:
- <ul>
-
- <li>Inlined images may be virtually any type which ChangeFSI autorecognises,
- including RISC OS sprites (although not 'deep' sprites, yet)
-
- <li>Since RISC OS sprite areas may contain multiple sprites, I have extended
- the same principle used for documents, to images. Hence, something like
- <img src="myfile#myiconbar"> will retrieve the sprite called
- <em>myiconbar</em> from <em>myfile</em> which resides in the same directory
- as the document that contains it. Furthermore, omitting the filename will
- force a look up in the Wimp common sprite pool, so <img
- src="#switcher"> will get you the <img src="#switcher" alt="Task
- Manager">icon.
-
- <li>URLs may reference files on the local machine. These are recognised by
- the syntax: <tt>local://filing-system/file-from-$</tt>. The filing system
- includes the media specifier, so <em>ADFS::HardDisc4</em> is an example of a
- valid filing system. The rest of the filename is given from and including
- the root. Filing systems without media specifiers may be used by omitting
- that part of the FS name (see the example with <tt>resources:</tt> below. In
- the path name, all / and . characters are transposed to make it look more
- like a conventional URL.
-
- <li>local: URLs may point to applications, in which case following them will
- launch the application. eg. <a href="local://resources:/$/Apps/!Help">
- will open an anchor which will <a
- href="local://resources:/$/Apps/!Help">launch Acorn's !Help</a> application.
- However, for your own protection, this will NOT happen unless the page
- containing the link to an application was also loaded from a local: page.
-
- <li>Some of the extensions proposed by <a href="netscapext">Netscape
- Communications Corp.</a> have had support added for them as well, including
- background images, colour changing, id attribute for any tag.
-
- <li>Some of the HTML 3.2 "Wilbur" extensions have been added,
- such as referencing certain colours by name.
-
- <li>ArcWeb has support for <tt>finger</tt> URLs as well. Even Netscape
- 2 doesn't have these yet!
-
- </ul>
-
- <hr>
- Stewart Brodie<br>
- 29 June 1996
-