Difference between browser-supported handlers and Shazzer 'all_browser_events' list

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function listAllEventHandlers() {0x0D
    const allHandlers = new Set();0x0D
    const objects = [document.body, document, window];0x0D
    objects.forEach(obj => {0x0D
        for (const prop in obj) {0x0D
            if (prop.startsWith('on')) {0x0D
                allHandlers.add(prop);0x0D
            }0x0D
        }0x0D
    });0x0D
    return Array.from(allHandlers).sort();0x0D
}0x0D
allBodyHandlers = listAllEventHandlers();0x0D
0x0D
console.log("window, document and document.body contain " + allBodyHandlers .length + " handlers")0x0D
0x0D
const shazzerEvents  = new Set();

shazzerEvents.add('$[data1]');

console.log("Shazzer 'all_browser_events' contains " + shazzerEvents.size + " events");0x0D
0x0D
function missingHandlers() {0x0D
const out = new Set();0x0D
    for(let handler of allBodyHandlers) {0x0D
        if (!shazzerEvents.has(handler)) {0x0D
            out.add(handler);0x0D
        }0x0D
    }0x0D
return out;0x0D
}0x0D
0x0D
for(let handler of missingHandlers()){0x0D
   log(handler);0x0D
}