JavaScript Document Body Contenteditable True

In this article, we will explore the code “document.body.contenteditable = ‘true’; document.designmode=’on’; void 0” and its purpose in enabling content editing on a web page. We will discuss the various reasons behind the occurrence of this error message and provide multiple methods to resolve it.

Why Does the Error Occur?

The “document.body.contenteditable = ‘true’; document.designmode=’on’; void 0” error can occur due to several reasons, including network and browser incompatibility, incorrect syntax, and misuse of operands. It can also occur when the code is not executed in the proper context.

Browser Incompatibility

The “contenteditable” and “designmode” attributes are not universally supported by all web browsers. When the JavaScript code attempts to change the mode of the page without checking for compatibility, the error occurs in unsupported browsers.

Browser incompatibility

Incorrect Syntax

Using incorrect syntax can lead to syntax errors, preventing the code from being executed and causing debugging difficulties. The error message can occur if there are issues with the syntax of the JavaScript code, such as missing semicolons or incorrect use of quotes.

Misuse of Void Operator

The void operator is used to specify that a value is undefined. In the error message, it is being used without a proper argument, causing an error.

Incorrect Usage

The “contenteditable” and “designmode” attributes are used to enable content editing for a web page. If the code attempts to modify these attributes without proper understanding or implementation, it can lead to the error.

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Fixes for the Error

To fix the “document.body.contenteditable = ‘true’; document.designmode=’on’; void 0” error, it is important to ensure that the code is executed in the proper context and that the elements and properties are available. Here are some solutions:

Check Browser Compatibility

Before setting the values of the contentEditable and designMode properties, check if they are supported by the browser to avoid errors.

if ('contentEditable' in document.body) {
  document.body.contentEditable = 'true';
} else {
  console.error('Your browser does not support the contentEditable property.');

if ('designMode' in document.body) {
  document.designMode = 'on';
} else {
  console.error('Your browser does not support the designMode property.');

Feature Detection

Feature detection is a technique used to check if specific properties or APIs are available in the current browser before using them. By using feature detection, you can ensure that your code runs correctly across different browsers.

if ('contentEditable' in document.body) {
  document.body.contentEditable = 'true';
} else {
  console.log('contentEditable is not supported in this browser');

// Additional feature detection examples

Use a Library or Framework

Consider using a library or framework, such as React or Angular, that handles cross-browser compatibility issues and provides a consistent API.

Use Modern APIs

Using modern APIs, such as the ExecCommand API, can provide better support across browsers for controlling content editability and design mode.

Re-evaluate the Design and Implementation

If possible, re-evaluate the design and implementation of your project to find alternative ways to achieve the desired functionality without relying heavily on contentEditable and designMode.

Use Correct Syntax

Using the correct syntax is essential for writing understandable code that avoids errors or unexpected behavior. Follow established coding standards and conventions for the programming language you are using.

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Use Proper Functions

Use the code “(function(){document.body.contenteditable = ‘true’;document.designmode = ‘on’;})();”, which is an anonymous function that is immediately executed. This code enables editing and allows users to modify the web page directly in the browser.

<button id="editBtn">Edit</button>
  document.getElementById('editBtn').addEventListener('click', function() {
    (function() {
      document.body.contentEditable = 'true';
      document.designMode = 'on';


In this article, we explored the reasons behind the “document.body.contenteditable = ‘true’; document.designmode=’on’; void 0” error and provided multiple methods to resolve it. By following the solutions outlined, you can effectively eliminate this error message and ensure a smooth editing experience on your web page. Happy coding!