add examples for exportparts and slotted children

Sascha Schulz

2024-02-19 62ae95c43c7ab46ecf8f24342ae937fa82095194

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