Namespace: load

just.load(tagnon-null, urlnon-null, handleropt, listeneropt) → {*}

Loads an external file if no other similar element is found.

Name	Type	Default	Description
`tag`	element_tag		A tag name.
`url`	url		The url of the file.
`handler` _[optional]	just.loadElement~handler	appendToHead	If it's a function: it will be triggered (without appending the element), otherwise: the element will be appended to head.
`listener` _[optional]	just.loadElement~listener		A function to trigger after the element is appended.

document.createElement exception or TypeError if url is missing.

The return of the handler.