Is the HTML output of quill.root.innerHTML always safe?

No, the HTML output of quill.root.innerHTML is not always safe. While Quill is a powerful and popular WYSIWYG (What You See Is What You Get) editor for creating rich text content, using innerHTML to extract or insert HTML content can pose security risks if not handled carefully.

The main concern is that using innerHTML can potentially lead to Cross-Site Scripting (XSS) attacks. XSS attacks occur when an attacker injects malicious scripts into web pages viewed by other users. If the content of the Quill editor is not properly sanitized or validated, an attacker can inject harmful code that may steal sensitive information or compromise the user's browsing experience.

To ensure safety when dealing with HTML output from Quill, you should take appropriate measures to sanitize the content before displaying it or storing it in your database. Sanitization involves removing or escaping any potentially dangerous HTML tags, attributes, or JavaScript code while preserving the necessary formatting and content.

A common approach to secure the HTML output from Quill is to use a library designed for HTML sanitization, such as DOMPurify. DOMPurify is a widely-used library that helps to prevent XSS attacks by sanitizing and cleaning up HTML content.

Here's an example of how you might use DOMPurify to sanitize the HTML output from Quill:

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const quill = new Quill('#editor');
const output = quill.root.innerHTML;

// Sanitize the output before displaying or storing it
const sanitizedOutput = DOMPurify.sanitize(output);

// Now you can use sanitizedOutput in your application

By using DOMPurify or a similar library, you can significantly reduce the risk of XSS attacks and ensure that the HTML output from Quill is safer to use in your application. Remember to keep the library up to date, as security vulnerabilities can be discovered and patched over time.