HTML, CSS & JavaScript IDE

The online web development IDE for K-12 education

index.html

<!DOCTYPE html>
<html>
  <head>
    <style>
      body { font-family: system-ui; margin: 0; padding: 12px; }
      h1 { font-size: 18px; margin: 0 0 6px; }
      .area { color: #2563eb; font-size: 20px; font-weight: 700; margin: 0; }
    </style>
  </head>
  <body>
    <h1>Rectangle</h1>
    <p class="area" id="area"></p>

    <script>
      const length = 14.5;
      const width = 7.5;

      const area = length * width;

      document.getElementById("area").textContent =
        "The area is " + area + " square feet";
    </script>
  </body>
</html>

Preview

Press Run.

Works on any device

Runs in the browser — nothing to install.

Automated grading

Tests run against every submission.

Fully customizable

Edit the lesson, starter code, and tests.

Start Coding Now

Browser-Based Web Development IDE

JuiceMind's online HTML, CSS and JavaScript IDE runs entirely in your browser — students build real pages and see them render as they type. Built for K-12 classrooms, from a first <h1> to a finished portfolio site.

Live Preview as You Type

The page renders beside the code, so a change to markup or styling is visible immediately.

Test Cases & Autograding

Configure unit tests that run against student code and return instant feedback automatically.

Built-in Error Detection

Console errors and inline highlighting point students to the exact line that broke.

Works on Chromebooks & Tablets

Any device with a web browser. Nothing to install, update, or get past IT for.

HTML, CSS & JavaScript Together

Structure, styling and behaviour in one project, the way a real site is actually built.

Save, Share & Submit

Student work saves automatically and can be shared with a link or turned in for grading.

Also available for web development

JavaScript p5.js Web Development course

Open Web Development IDE

Why use JuiceMind as a teaching tool?

A complete platform built for K-12 computer science education

LTI Integration

Works with Canvas, Google Classroom, and Schoology.

Web-based

Students complete everything on any web browser.

Group Projects

Students collaborate in real-time with classmates.

Debugger

Step through code line by line to find the problem.

Pre-made Exercises

Ready-to-use exercises and projects you can assign today.

24-Hour Support

Customer support around the clock when a class needs it.

Ready to Start Coding?

Jump into our Web Development IDE and start writing code in seconds. No signup required to try it out.

Start Coding Now View Curriculum