Inject HTML snippet from file

A question on stackoverflow:

Include another HTML file in a HTML file

I was playing around and came up with a clean way to do it with:
1) Reading a content of the file with fetch()
2) Rendering a DOM Node from string
3) Replacing

• An in-depth analysis of the Bootstrap list group component
• Detailed explanation of JavaScript function currying
• Complete example of JS password generation and strength detection (with demo source code download)
• Angularjs integrates WeChat UI (weui)
• How to quickly switch between Traditional Chinese and Simplified Chinese with JavaScript and the trick for websites to support switching between Simplified and Traditional Chinese_javascript skills