I've searched around, and can't find a solution that works for me.

• I have a simple HTML file with an iFrame (I plan to change this to PHP for other reasons),
• The SRC of this iFrame is a child HTML file (same domain),
• This Child HTML has an external JS file (same folder),
• The external JS file contains a parent function,
• and finally within that parent function I have an object that has method.

To help visualize.

[Parent.html] > [iFrame] > [Child.html] > [Child.html's external.js] > [Function] > [Object.method()]

This Object Method is what I would like to invoke from the Parent HTML