I am checking out the "Promises/A+" Specification, but could not understand the following things:  On Section 1. Terminology,  1.1. "promise” is an object or function with a then method whose behavior conforms to this specification....
Running new XMLHttpRequest().responseType = "json" in the console throws an "InvalidStateError" exception in Firefox 26 and IE11 but not in Chrome 31.  Why?  The Spec states that setting responseType     throws an "InvalidStateErr...
I've recently been playing with the Javascript Fetch API. As far as I understand, by default all redirects are handled transparently and in the end I get a response from the last call in the redirect chain.  However, I could invoke fetch with {re...
Using prompt() I am generating some html to and need to know the maximum length that I can put in the popup.  I can't find anything in the spec about this, wondering if someone can help...
Today I tested what happens when you use getBoundingClientRect() on an SVG element that has been rotated.   Test: http://phrogz.net/svg/getBoundingClientRect-on-rotated-elements.html  The result is that:   Chrome, Safari, Opera, and IE appear to calc...
I am starting to love jQuery but as PHP developer I hate using that   $().stuff   as everyone know $ in PHP marks variables. I guess jQuery in javascript declares a function like this  function $(element) {/*stuff*/}  Does javascripts permits $ as th...
recently, I had the urgent requirement to give my server a notice, that a specific page of my webapp is about to get closed. "Easy peasy" I thought, beforeunload is available for quite a while. The HTML5 "thing" even refreshed the spe...
I'm wondering if there is any build-in support for the HTML5 Notification feature in Gecko browsers so far? Maybe some hidden developer thingy ?  I'm aware of WebKits window.webkitNotifications which works great, so, is there a Firefox implem...
The ECMAScript specification defines the Atomics object in the section 24.4.  Among all the global objects this is the more obscure for me since I didn't know about its existence until I didn't read its specification, and also Google hasn'...

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