When entering a code line in Aptana Studio like
<input id="send" type="button" value="Send" onclick="calculate()" />
Aptana shows a warning: “input proprietary attribute onclick”.
I wonder if this is a bug. There was a similar problem just a few days ago:
https://jira.appcelerator.org/browse/APSTUD-4873 called
“‘button proprietary attribute onclick’ is invalid warning”
Version: Aptana Studio 3, build: 3.1.3.201205292243
Yes, it is covered in that JIRA ticket and resolved in the latest nightly build of Aptana Studio 3.2.