DOMTokenList Validation Added in Chrome 50

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In Chrome 50, you'll be able to check the support of options for some HTML attributes that are backed by DOMTokenList instances in JavaScript. Right now, these places are:

  • iframe sandbox options
  • link relations (the rel attribute, or relLink in JavaScript)

Let's show a quick example:

var iframe = document.getElementById(...);
if (iframe.sandbox.supports('an-upcoming-feature')) {
// support code for mystery future feature
} else {
// fallback code
if (iframe.sandbox.supports('allow-scripts')) {
// instruct frame to run JavaScript
// NOTE: this is well-supported, and just an example!

As the list of supported options grows and changes, you can use feature detection to perform the correct actions for your web applications.

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