Retro-compatibility and polyfills

Sources for checkin if some functionality work in old browsers:, … or you can just use a search engine looking for the term Polyfill.

A polyfill is a piece of JavaScript code you include in your HTML page, that will emulate HTML5 features not yet implemented in browsers. Usually a polyfill starts emulating a feature only when native support is not detected.


Just add JS script:

  1. <!DOCTYPE html>
  2. <html>
  3. <head>
  4.    <meta charset=“UTF-8”>
  5.    <title>Contact manager</title>
  7.       (function(e,t){function r(e){var t=null;… // POLYFILL CODE HERE!
  8.        …
  10. </head>

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