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name html-viewer-with-two-way-highlight
description Online HTML viewer, HTML runner, HTML test tool with real-time two-way code-element highlight. Click code to highlight preview element, click element to jump back to code. Ideal for HTML beginners.
tags
html
html viewer
html runner
html test
html preview
frontend
beginner
learning
debugging
version 1.0.0
author html-viewer.org
website https://html-viewer.org

HTML Viewer with Two-Way Highlight (For Beginners)

Overview

This is a free online HTML viewer, HTML runner, HTML test and HTML preview tool built for HTML beginners. The core feature is real-time two-way code-element highlighting, which helps learners understand the relationship between code and rendered UI quickly and intuitively.

Key Features

  • Two-way highlight: Click code to highlight the corresponding element in the preview. Click any element to jump to its source code.
  • Instant HTML preview & run: Paste HTML code and see the result immediately as a real HTML runner.
  • Simple & clean UI: No ads, no login, no installation.
  • Lightweight & fast: Pure static website, works on any browser.

Ideal For

  • HTML beginners learning tags and layout
  • Quick HTML test and debugging
  • Teaching HTML code-structure relationships
  • Online HTML preview without local environment

How to Use

  1. Open https://html-viewer.org
  2. Paste or type your HTML code in the editor
  3. The preview shows instantly as an HTML previewer
  4. Click code on the left → element highlights on the right
  5. Click element on the right → code highlights on the left

Example

<!DOCTYPE html>
<html>
<head>
  <title>Demo</title>
</head>
<body>
  <h1>Hello HTML</h1>
  <div>This box will highlight when clicked</div>
</body>
</html>