add dark mode js demo on chapter 3 slide

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2026-04-20 12:54:52 +02:00
parent 0367f07166
commit 754ff9436c
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@@ -755,6 +755,8 @@ Formular-Validierung ohne Reload
# Beispiel: Toggle Dark Mode
![bg right:35%](./assets/demos/js-darkmode.png)
```javascript
const toggleButton = document.querySelector("#darkModeToggle");
const body = document.body;