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...
What is the meaning of polyfills in HTML5? I saw this word in many sites about HTML5, e.g. HTML5-Cross-Browser-Polyfills.     So here we're collecting all the shims, fallbacks, and polyfills   in order to implant HTML5 functionality in browsers t...
What are the options for using the let keyword in javascript. It seems like it would be really useful.  I've seen traceur, but I'm wondering if there are any other options, so I don't have to run entire projects through it.  Is it even po...
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 need to build a component that should need to work with both specs, custom elements spec v0 which got deprecated and custom elements spec v1, latest stable version.  If I build components with custom elements v0 spec some apps will face issues sinc...
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&...

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