Add Safari versions for api.HTMLFieldSetElement.element.type_HTMLCollection (#13034)
Add Safari versions for api.HTMLFieldSetElement.element.type_HTMLCollection (#13034)

This PR adds real values for Safari (Desktop and iOS/iPadOS) for the `element.type_HTMLCollection` member of the `HTMLFieldSetElement` API, based upon manual testing.

Test Code Used:
```js
var el = document.createElement('fieldset');
alert(el.elements.constructor.name);
```
mdn/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data,chrisdavidmills/browser-compat-data