custom-elements
Get the global customElements object for the current context.
    CUSTOMELEMENTS([newCustomElements])
  
  Optionally sets, and returns, the customElements object for the context.
var customElementsShim = require('some-custom-elements-shim');
CUSTOMELEMENTS(customElementsShim);
CUSTOMELEMENTS() //-> customElementsShim
Parameters
- customElements {Object}:An optional CustomElementRegistry-like object to set as the context's customElements 
Returns
 {Object}: 
The customElements object for this JavaScript environment.
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