Function getElement

getElement(el: string | HTMLElement): undefined | HTMLElement
Helper function for determining the HTML element through the transmitted parameters
Parameters
- el: string | HTMLElement
Returns undefined | HTMLElement
Example
```
let el = getElement(HTMLElement || 'element-id');
el = getElement('#element-id .sub-class');
el = getElement('.element-class');
```
- Defined in dom.ts:28