How do I make HTML5 secure?

HTML5 is the latest version of the Hypertext Markup Language (HTML), which is used to structure and format content on the web. While HTML5 has many new features and capabilities that have improved the web experience for users, it has also introduced new security risks that developers and users need to be aware of.

Some common HTML5 security issues include:

1. Cross-Site Scripting (XSS): As mentioned earlier, XSS is a type of vulnerability that allows an attacker to inject malicious code into a website. HTML5 introduces new features that can be used to execute XSS attacks, such as web sockets and cross-origin resource sharing (CORS).
2. Clickjacking: This type of attack involves tricking a user into clicking on a link or button that appears to do one thing, but actually does something else. For example, an attacker could create a button that appears to close a pop-up window, but actually installs malware on the user's device.
3. Cross-Site Request Forgery (CSRF): This type of attack involves tricking a user into making a request to a website that they are already logged into, without their knowledge. For example, an attacker could create a link that appears to be a legitimate website, but when clicked, submits a request to the user's bank to transfer money.

To protect against these and other HTML5 security issues, developers should use content security policies, input validation and sanitization, and proper authentication and authorization controls. Users should also be cautious when clicking on links and buttons, and keep their browser and security software up to date.

For more detailed information, you can check the cheatsheet.