Clicklets are the small, usually orange-colored buttons that provide access to web pages, blog posts, articles or other information in alternate formats, such as RSS feeds. The name "Clicklets" is similar to the trademarked name of rectangularly-shaped chewing gum that sounds like "chicklets" (which are actually young chickens, but not spelled the same as the trademarked name), because the shape of Clicklets reminds people of the shape of the pieces of that brand of gum.
| HTML Version | Clicklet Appearance | Recommended File Extension | Development Targets |
|---|---|---|---|
2008
HTML
5 (draft) with
HTML Style Sheets
with X-UA-Compatible: IE=8
HTTP
header
|
HTML 5 Style Sheet | .xhtml5 | new development for IE6, IE7, IE8 and standards-compliant browsers such as Firefox when there are elements, such as navigation, that are common to multiple pages on the site which can be put into templates |
2008
HTML
5 (draft) with
HTML Style Sheets,
no X-UA-Compatible
HTTP
header
|
IE 7 Style Sheet | .xhtml5 | previously existing documents for IE6, IE7 with elements, such as navigation, that are common to multiple pages on the site that have been put into templates |
2008
HTML
5 (draft)
XML
without HTML Style Sheets
with X-UA-Compatible: IE=8
HTTP
header
|
HTML 5 XML | .html5 | new development for IE6, IE7, IE8 and standards-compliant browsers such as Firefox when there is no similarity among different pages on the site |
2008
HTML
5 (draft)
XML
without HTML Style Sheets,
no X-UA-Compatible
HTTP
header
|
IE7 HTML 5 XML | .html5 | previously existing documents for IE6, IE7 when there is no similarity among different pages on the site |
| 2008 HTML 5 (draft) non-XML | IE 4+ HTML 5 | .htm5 | IE4+ and older browsers |
| 1999 through 2007 XHTML 1.x with HTML Style Sheets | XHTML 1 Style Sheet | .xhtml | standards-compliant browsers such as Firefox |
| 1999 through 2007 XHTML 1.x without HTML Style Sheets | XHTML 1 | .html | full screen browsers that do not support HTML style sheets |
| 2006 XHTML 2 (draft) with HTML Style Sheets | XHTML 2 Style Sheet | .xhtml2 | |
| 2006 XHTML 2 (draft) without HTML Style Sheets | XHTML 2 | .html2 | |
| 1997 HTML 4.01 | HTML 4 | .htm | IE4+ and older browsers, browsers that prefer the DOS 8.3 file naming convention |
| HTML Version | Clicklet Appearance | Recommended File Extension | Development Targets |
|---|---|---|---|
| XHTML Mobile Profile 1.0 | XHTML Mobile | .mp | Internet-enabled cell phones and other wireless mobile or handheld devices |
| WML 1.0 | WML Mobile | .wml | older wireless devices |
These are listed in more-or-less ascending chronological order.
More recent specifications have attempted to correct the biggest limitation of those based
on
RSS
0.92,
which is that the names of some elements are not qualified with a namespace URI.
However, the Really Simple Syndication flavors of RSS are still more commonly used in practice,
so
RSS
0.92 v2.0
is the version currently recommended unless the feed needs to be aggregated with content from other namespaces.
(In all versions of
RSS
based on
RSS 0.92, the primary element names are in the null namespace, so although elements from
other namespaces may be included in feed documents, the null-namespaced elements such as
channel and item cannot be aggregated with other content as
easily as those from formats which have elements that are qualified with a namespace URI.)
This recommendation may change depending on how well a future version of the
RDF
flavor of RSS
(
RSS
1.1 or
RSS
2.0)
or of Atom becomes adopted.
| Document Format | Clicklet Appearance | Recommended File Extension | Development Targets |
|---|---|---|---|
| RSS 0.92 v2.0 with XML Style Sheet | RSS 0.92 v2.0 | .rss | standalone documents for feed readers and IE6, IE7 or IE8 |
| RSS 0.92 v2.0 | RSS 0.92 v2.0 | .rss | standalone documents for feed readers |
| RSS 1.0 with XML Style Sheet | RDF RSS 1.0 | .rdf | documents for feed readers and IE6, IE7 or IE8 that may need to be aggregated with content from other namespaces |
| RSS 1.0 | RDF RSS 1.0 | .rdf | documents for feed readers that may need to be aggregated with content from other namespaces |
|
RSS 1.x
RSS 2.x |
DO NOT USE. Although some implementers omit
"RDF" from the text on Clicklets for the RDF version of RSS and
hope users will be able to determine the heredity simply from
the version number, this will become even more confusing when the
specifications of RDF RSS are updated to the next major version after
RSS
1.x,
namely
RSS
2.x.
|
||
| Atom 1.0 with XML Style Sheet | Atom 1.0 | .rss | documents for feed readers and IE6, IE7 or IE8 that may need to be aggregated with content from other namespaces |
| Atom 1.0 | Atom 1.0 | .rss | documents for feed readers that may need to be aggregated with content from other namespaces |
| Document Format | Clicklet Appearance | Recommended File Extension | Development Targets |
|---|---|---|---|
| MPEG-3 | MPEG-3 Audio | .mp3 | audio podcast receivers |
| Windows Media Video | Windows Video | .wmv | video podcast receivers or iTunes on the Windows platform |
| QuickTime | QuickTime Video | .mov | iTunes on the Windows or Apple Mac OS X platform |
| MPEG-4 Video | MPEG-4 Video | .mp4 | video podcast receivers or iTunes on the Apple Mac OS X platform;
(results in various messages on the Windows platform including:
|
| Document Format | Clicklet Appearance | Recommended File Extension | Development Targets |
|---|---|---|---|
| printers | |||
| RDF | RDF Metadata | .rdf | Symantic Web clients |
| XML 1.0 with XML Style Sheet | XML | .xml | IE6, IE7, IE8 and standards-compliant browsers such as Firefox |
Last updated Wednesday February 6, 2008
Printer-friendly PDF* format:
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