ignoreCustomElements = tagPrefix => {
    if (typeof tagPrefix !== "string" || !tagPrefix.length) {
      throw new Error("Only string characters for a tag prefix.");
    }
    tagPrefixes.push(tagPrefix);
  }
Ignores all custom HTML elements with a given tag prefix to improve the rendering performance of the UI5 Web Components.
<br>

<b>When used:</b> the UI5 Web Components framework treats all custom HTML elements,
starting with the given prefix as if they are standard HTML elements, such as: `div`, `span`, etc, without additional processing.
<br>

<b>When not used:</b> the framework waits for the slotted children to be defined and registered first,
because the state or visual appearance of the parent may rely on the slotted elements/children.

<b>Note:</b> We recommend using `ignoreCustomElements` when slotting custom HTML elements (with only semantic purpose)
inside UI5 Web Components, to improve the time to render.

@public
@since 1.14.0
@param { string } tagPrefix