HTML Create a Cookie Clicker Site – Part 4 Multiplier Upgrade

This is the long awaited part 4 to the HTML How to Create a Cookie Clicker Website. Within this episode we will be looking at the multiplier upgrade.
I mention ending the series with the next episode, but after some thinking I’ve got a few more ideas to add mainly relating to its target rewritten below.
Part 3:
Part 5: Not Yet Out
Playlist:

Within this series we will slowly create a cookie clicker styled website with features like unlockables for progression, achievement popups, and some CSS styling to spice the site design up.

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Links:
Brackets – (A modern, open source text editor that understands web design.)
Source code for this episode: