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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/DOMTokenList/supports below:

DOMTokenList: supports() method - Web APIs

Baseline Widely available

The supports() method of the DOMTokenList interface returns true if a given token is in the associated attribute's supported tokens. This method is intended to support feature detection.

token

A string containing the token to query for.

A boolean value indicating whether the token was found.

const iframe = document.getElementById("display");

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 feature is well-supported; this is just an example!)
  //
}

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