script.js

(function() {
 
    // Create input element for testing
    var inputs = document.createElement('input');
     
    // Create the supports object
    var supports = {};
     
    supports.autofocus   = 'autofocus' in inputs;
    supports.required    = 'required' in inputs;
    supports.placeholder = 'placeholder' in inputs;
 
    // Fallback for autofocus attribute
    if(!supports.autofocus) {
         
    }
     
    // Fallback for required attribute
    if(!supports.required) {
         
    }
 
    // Fallback for placeholder attribute
    if(!supports.placeholder) {
         
    }
     
    // Change text inside send button on submit
    var send = document.getElementById('contact-submit');
    if(send) {
        send.onclick = function () {
            this.innerHTML = '...Sending';
        }
    }
 
})();