Returns a Promise that is resolved when the given checkFn function returns
a value other than null or undefined or the
Document:readyState
becomes "interactive".
It always calls the given checkFn first before examining the readyState.
If the readyState became interactive before the element was found, the
Promise resolves to null. Otherwise the Promise is resolved with checkFn's
return value.
The function is called initially, and then every time there are changes to
the DOM children. Uses
MutationObserver.
Returns a Promise that is resolved when the given
checkFnfunction returns a value other thannullorundefinedor the Document:readyState becomes "interactive".It always calls the given
checkFnfirst before examining thereadyState.If the
readyStatebecame interactive before the element was found, the Promise resolves tonull. Otherwise the Promise is resolved withcheckFn's return value.The function is called initially, and then every time there are changes to the DOM children. Uses MutationObserver.