Preventing 100% of automated form spam

The “Custom Tag Method”

Considering these drawbacks, I decided to develop my own anti-spam method, called the “Custom Tag” method. I have been using this method very successfully for some time now and have not had a single spam submission since implementing it! The “Custom Tag Method” is simple to implement, does not invade anyone’s privacy and does not require people to prove their humanness. I use it with form elements, but it actually works with any html element and in all modern browsers.

How it works

  1. Add an opening and a closing tag (!) with the name f-f
<f-f el=”input”></f-f>
<f-f el=”textarea”></f-f>
<f-f el=”select”></f-f>
<f-f el=”input” type=”text” name=”name” class=”formel”></f-f>
<f-f el=”input” type=”checkbox” name=”mycheckbox” value=”Yes” checked></f-f>
<f-f el=”input” type=”radio” name=”mycheckbox” value=”No” checked></f-f>
<f-f el=”textarea” name=”message” style=”height:40px;width:200px;”></f-f>
<f-f el=”select” name=”mycheckbox2"><option value=”Monday”>Monday</option><option value=”Tuesday”>Tuesday</option></f-f>
//register the custom element document.addEventListener("DOMContentLoaded", function () {
window.customElements.define('f-f', class extends HTMLElement {});
//get an array of f-f elements to convert
const els = document.getElementsByTagName("f-f");
//loop through the array of elements
for (let i=els.length-1;i>=0;i - ){
//create an object of the attributes
let attrs = els[i].getAttributeNames().reduce((acc, name) => {
return {…acc, [name]: els[i].getAttribute(name)};
}, {});
//create a new element using the el attribute
let el = document.createElement(attrs["el"]);
for (let key in attrs){ //loop through the array of attributes
//filter out the el attribute
if(attrs.hasOwnProperty(key) && key != "el"){
//add all other attributes to the new element
el.setAttribute(`${key}`, `${attrs[key]}`);
//loop though the child nodes of the f-f
while (els[i].childNodes.length > 0) {
//append child nodes to the new element
//insert the new element into the DOM
els[i].parentNode.insertBefore(el, els[i]);
els[i].remove(); //remove the f-f element from the DOM





Product Designer, Frontend Developer and Usability Engineer at Digiata

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Franz Rodenacker

Franz Rodenacker

Product Designer, Frontend Developer and Usability Engineer at Digiata

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