Keyboard Events

    // Keyboard events in the Browser
    // keydown keyup keypress
    // ev.char || ev.charCode || ev.which 
    let log = console.log;
    
    document.addEventListener('DOMContentLoaded', init); 

    function init( ){
        let txt = document.getElementById('txt'); 
        txt.addEventListener( 'keydown', anyKey);
        document.body.addEventListener('keydown', anyKey);
    }
    
    function anyKey(ev){ 
        log(ev.type, ev.target);
        let target = ev.currentTarget; 
        let tag = target.tagName;
        let char = ev.char || ev.charCode || ev.which; 
        log(char, tag);
        let s = String.fromCharCode(char); 
        log(s);
        switch(char) { 
            case 37:
            log('LEFT');
            break;
            case 40:
            log('DOWN');
            break;
        }
    }