1. /**

  2.  * Copyright (c) Meta Platforms, Inc. and affiliates.

  3.  *

  4.  * This source code is licensed under the MIT license found in the

  5.  * LICENSE file in the root directory of this source tree.

  6.  *

  7.  * @flow

  8.  */

  9. 

  10. function isCustomElement(tagName: string, props: Object): boolean {

  11.   if (tagName.indexOf('-') === -1) {

  12.     return false;

  13.   }

  14.   switch (tagName) {

  15.     // These are reserved SVG and MathML elements.

  16.     // We don't mind this list too much because we expect it to never grow.

  17.     // The alternative is to track the namespace in a few places which is convoluted.

  18.     // https://w3c.github.io/webcomponents/spec/custom/#custom-elements-core-concepts

  19.     case 'annotation-xml':

  20.     case 'color-profile':

  21.     case 'font-face':

  22.     case 'font-face-src':

  23.     case 'font-face-uri':

  24.     case 'font-face-format':

  25.     case 'font-face-name':

  26.     case 'missing-glyph':

  27.       return false;

  28.     default:

  29.       return true;

  30.   }

  31. }

  32. 

  33. export default isCustomElement;
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