Discovered custom data attribute in HTML5. Basically, you can have arbitrary attribute names, and the only requirement is that the names starts with
data-. Here's a example used by twitter:
<a href="https://twitter.com/share" class="twitter-share-button" data-via="xah_lee">Tweet</a>
Here's the spec: Source dev.w3.org. Quote:
A custom data attribute is an attribute in no namespace whose name starts with the string “data-”, has at least one character after the hyphen, is XML-compatible, and contains no characters in the range U+0041 to U+005A (LATIN CAPITAL LETTER A to LATIN CAPITAL LETTER Z).
Here's a example of how i use it.
I write many blogs, often i link to other sites. I want the link to contain accessed date, so if years later the link went dead, i know the date i viewed it, and can then possibly dig it up.
Because there isn't a attribute for access date, and i don't want access date as text because that's distracting to readers. So, i use the “title” tag as a workaround, like this:
<a href="…" title="accessed:2012-09-22">important article</a>
Now i change them to this:
<a href="…" data-accessed="2012-09-22">important article</a>
When the site went dead, i can also add a defunct date, like this:
〈Google Custom Search Element〉 @ <s class="deadurl" title="accessed:2009-06-11; defunct:2012-07-06">http://www.google.com/webelements/customsearch/</s>
Now i can do it like this:
〈Google Custom Search Element〉 @ <s class="deadurl" data-accessed=":2009-06-11" data-defunct="2012-07-06">http://www.google.com/webelements/customsearch/</s>