add examples for event handling in web components

Sascha Schulz

2024-03-18 2c684af29f61555fce48e67993a865e4ba091698

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const p = new Promise(function(resolve, reject) { 
    reject(new Error("Fehler")); 
}); 
 
p.catch(function(e) { 
    console.log(e.message); 
});