Javascript features list

Is there a maintained list of available JS features ?
I found this http://wiki.netsurf-browser.org/Development_Plan
but it looks a bit out of date and I found some circular references
on http://www.netsurf-browser.org/documentation/info.html#JavaScript


I am looking at a survey form and wondered if buttons should work ?


The code in question is:

<input class="btn btn-large surveyFooterSubmitBtn"
id="SurveySubmitButtonElement"
onClick="if (this.form.validate)
{if (this.form.validate())
{this.disabled=true;}
else
{return false;}
}
postExecuteJavaScriptLogic();
customValidateAndSubmit(document.forms['run']);
this.disabled=true;
return false;"
TYPE="button" NAME="submitButton" VALUE="Continue">