This function was introduced in Textbox.io release 1.3.1.
Identify whether Textbox.io supports the current browser.
If this API returns false, all other APIs except version will throw an exception.
Example
textboxio.getActiveEditor()
// Identify whether Textbox.io is supported on this browser var supported = textboxio.isSupported();
Returns
textboxio.isSupported | Boolean | Whether or not the browser is supported |