[ShadyDOM] dispatchEvent on ShadowRoot throws an exception

[dfreedm]

Description

Live Demo

https://jsbin.com/wuqocab/edit?html,console,output

Steps to Reproduce

Expected Results

Actual Results

Browsers Affected

• [x] Chrome
• [x] Firefox
• [x] Edge
• [x] Safari 9
• [x] Safari 8
• [x] IE 11

Versions

• shadydom 1.5.0

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[stale[bot]]

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