In GUI Editor, this playground is broken.
It’s a lower/upper case problem: https://www.babylonjs.com/demos/productPage/ should be https://www.babylonjs.com/Demos/ProductPage/.
The url inside the PG can easily be fixed, but there are also some paths in the GUI snippet itself… I fixed it programmatically:
It would probably be better to fix the snippet, but I don’t know if it’s possible.
cc @carolhmj
The links can be fixed in the snippet as well with a new version: Babylon.js Gui Editor (babylonjs.com) 
PR to update the PG: Update broken PG in guiEditor.md by carolhmj · Pull Request #1030 · BabylonJS/Documentation (github.com)
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