<!-- begin snippet: js hide: false console: true babel: false -->
<!-- language: lang-js -->
document.getElementById("test").addEventListener("dragstart", function(e){
e.preventDefault();
});
<!-- language: lang-html -->
<input id="test" type="text" value="Drag text into textarea" />
<textarea></textarea>
<!-- end snippet -->
<!-- begin snippet: js hide: false console: true babel: false -->
<!-- language: lang-js -->
var myJSONObject = {"ircEvent": "PRIVMSG", "method": "newURI", "regex": "^http://.*"};
delete myJSONObject.regex;
console.log ( myJSONObject.regex); // logs: undefined
<!-- end snippet -->
This works in Firefox and Internet Explorer, and I think it works in all others.
