Which placeholder polyfill script do you recommend that I use to provide placeholder support in ie7, 8 & 9.  I've seen the following list from the modernizer team and was wondering if anybody here had some mileage with them or any others not...
After reading the article Removing Babel's Stage Presets by babel, I still not fully understand how to add a proposal from, for example, stage-3 (flatMap) to .babelrc.  As far as I understand, because flatMap can be written in ES5, then I need a...
I am using ChildNode.remove() and I described by Mozilla I need a polyfill for IE. I am using webpack with the babel-polyfill configured:   "babel-polyfill": "^6.13.0",  "webpack": "^2.4.1",   webpack.config.babel.js:...
Posted here is an answer that instructs those who miss the old window.showModalDialog JavaScript function to use the   <dialog>   element instead. I have used this along with the polyfill needed for IE and FF and it works. However, there is a n...
I am building a widget for third-party websites, using shadow DOM to prevent their CSS from interfering with ours. I am using the ShadyDOM and ShadyCSS polyfills to make it work in Edge and IE, but it is not transforming the CSS for the shadow DOM as...
In case of absence of native <input type="date"> support, I'd like to polyfill all the date inputs with datepicker widgets; for example, jQuery UI datepickers.  See the demo here. In Google Chrome it renders native date inputs, whil...
I'm looking for any javascript library that like modernizr (which actually does not) enables flexbox for "older browsers" (a polyfill).  Yea I know this is a really new feature (infact "there aren't" is a valid answer), but I&...
There has been a lot of discussion here and elsewhere about PhantomJS's lack of a Function.prototype.bind method, and a lot of helpful philanthropists have written shims/polyfills or pointed others to those resources. I'm implementing Phantom...
I have been playing around with Server-Sent Events and the equivalent Polyfill for IE and things work great with one glaring exception.  When I close the tab/browser or reload the page, the connection between the client and server remains open indefi...
Given an attribute on an event that will be browser prefixed, I'd like to create a polyfill that makes it appear unprefixed.  E.g. the interface FooEvent has an attribute webkitBar that I'd like to make appear as just bar so that handlers cou...

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