Browser Terms Explained: Trusted Types

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Browser Terms Explained: Trusted Types

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It's free and super easy to set up

Browser Terms Explained: Trusted Types

Get SigmaOS Free

It's free and super easy to set up

Browser Terms Explained: Trusted Types

The rise of web applications has led to an ever-increasing need for stronger and more robust browser security measures. One such measure gaining traction is Trusted Types, which aims to prevent cross-site scripting (XSS) attacks. This article will explain the concept of Trusted Types, how they enhance browser security, how to implement them in web applications, and how they work together with Content Security Policy (CSP).

Understanding Browser Security

Browser security has become a critical issue in recent years. As web technologies advance, the potential for security breaches through the browser is greater. Web developers and users must take proactive measures to ensure that browsers and web applications remain safe.

One of the main reasons why browser security is so important is because the internet is a vast and complex network. There are countless websites and web applications out there, and many of them are designed to collect personal information from users. If browser security is not taken seriously, users can fall victim to a wide range of online threats, including identity theft, financial fraud, and malware infections.

The Importance of Browser Security

Browser security is crucial in ensuring that users can browse the internet safely. Modern browsers include many features and technologies aimed at protecting user information, preventing malware infections, and preventing unauthorized access to sensitive data.

One of the key features of modern browsers is their ability to block pop-ups and other types of unwanted content. This is important because many pop-ups and other types of content can contain malicious code that can harm your computer or steal your personal information.

In addition to blocking unwanted content, modern browsers also include features like phishing filters, which can help protect you from online scams and other types of fraud. These filters work by analyzing the content of web pages and looking for signs of suspicious activity.

Common Browser Security Threats

One of the most common browser security threats is XSS attacks. These attacks involve injecting malicious code into an otherwise legitimate website. Attackers then use this code to gain access to sensitive information or to perform unauthorized actions on behalf of the user.

Another common browser security threat is malware, which is software designed to harm your computer or steal your personal information. Malware can come in many forms, including viruses, worms, and Trojan horses. To protect yourself from malware, it's important to keep your browser and other software up to date and to avoid downloading files or clicking on links from untrusted sources.

Finally, another common browser security threat is phishing, which is a type of online scam that involves tricking users into revealing their personal information. Phishing attacks can take many forms, including fake emails, fake websites, and fake login screens. To protect yourself from phishing attacks, it's important to be cautious when entering personal information online and to always verify the authenticity of websites and emails before providing any sensitive information.

What are Trusted Types?

Trusted Types are an essential browser security feature that helps to mitigate the risk of cross-site scripting (XSS) attacks. They achieve this by verifying that only authorized scripts run on a web page.

Trusted Types have become increasingly important as web applications have grown more complex, and the risk of XSS attacks has increased. They provide a valuable defense against these attacks, helping to keep users and their data safe.

The Concept Behind Trusted Types

The idea behind Trusted Types is to enforce strict and secure coding practices and prevent malicious code from being executed within a web page. When a developer writes code, it is scanned for any possible XSS vulnerabilities. Once those vulnerabilities are identified, they can be eliminated through secure coding practices.

Trusted Types are designed to work together with other security features, such as Content Security Policy (CSP), to provide a comprehensive defense against XSS attacks. By enforcing strict coding practices and limiting the execution of scripts, Trusted Types help to keep web applications secure.

How Trusted Types Improve Security

Trusted Types prevent attackers from injecting malicious code into a web page. This is achieved by using a Content Security Policy (CSP) to define a whitelist of trusted scripts. Any scripts that are not on the whitelist are blocked from execution, helping to prevent XSS attacks.

By limiting the execution of scripts to only those that are authorized, Trusted Types help to prevent attackers from taking advantage of vulnerabilities in a web application. This can help to keep user data safe and prevent sensitive information from being stolen or compromised.

Trusted Types are an important tool in the fight against XSS attacks, and they are becoming increasingly popular among developers who are looking to improve the security of their web applications. By enforcing strict coding practices and limiting the execution of scripts, Trusted Types provide a valuable defense against a wide range of security threats.

Implementing Trusted Types in Web Applications

Implementing Trusted Types in a web application can be challenging, but it is worth the effort to keep user data secure. The security of user data is of utmost importance in today's world where cyber threats are on the rise. Trusted Types can help in mitigating these threats by preventing the execution of untrusted scripts on web pages.

Setting Up Trusted Types Policies

To implement Trusted Types, you must first set up a Trusted Types policy. This policy defines the types of scripts that are allowed to run on the web page. The policy is created using a set of rules that define the types of scripts that are allowed to run. These rules are based on the content security policy (CSP) of the web application. The CSP defines the sources from which scripts can be loaded and executed on the web page.

Setting up a Trusted Types policy involves configuring the CSP to include the trusted types directive. The trusted types directive specifies the policy that should be used to enforce Trusted Types. Once the trusted types directive is added to the CSP, the web application will only execute scripts that comply with the policy.

Working with Trusted Type Objects

Developers must then create Trusted Type objects that are used to enforce the policy. These objects act as a protective layer that verifies scripts before they are executed. Trusted Type objects are created using the Trusted Types API, which provides a set of methods for creating and manipulating Trusted Type objects.

Trusted Type objects can be created for different types of scripts, such as HTML, CSS, and JavaScript. Each Trusted Type object is associated with a specific policy that defines the types of scripts that are allowed to be executed. When a script is loaded on the web page, it is first verified against the associated Trusted Type object to ensure that it complies with the policy.

Trusted Type objects can also be used to sanitize user input. When a user submits data to a web application, the data is first sanitized using the appropriate Trusted Type object before it is stored or displayed on the web page. This helps to prevent cross-site scripting (XSS) attacks, which are a common type of attack that exploits vulnerabilities in web applications to steal user data.

Trusted Types and Content Security Policy (CSP)

Trusted Types and CSP work together to provide a more comprehensive browser security solution. CSP defines a whitelist of trusted scripts, while Trusted Types ensure that only authorized scripts are executed within the web page.

Integrating Trusted Types with CSP

Trusted Types and CSP can be integrated by adding a header to the web page, specifying the Trusted Types policy and making sure that all scripts adhere to the policy.

Enhancing Security with Both Technologies

Using Trusted Types and CSP together can significantly enhance browser security. This approach makes it much more difficult for attackers to execute malicious code within a web page, making it a valuable addition to any security strategy.

Browser Support for Trusted Types

Trusted Types are relatively new, so not all browsers support them yet.

Current Browser Compatibility

The latest versions of Firefox and Chrome both support Trusted Types. However, Internet Explorer, Edge, and Safari do not yet support this technology.

Future Developments in Browser Support

There is much enthusiasm for Trusted Types from security experts and web developers, and we can expect other browser vendors to add support for this technology in the future. As more web applications adopt Trusted Types, it will become an increasingly important feature for web security.


Trusted Types are an exciting development in browser security, offering a new way to protect against XSS attacks. Although implementing Trusted Types can be challenging, the benefits of added security for web applications and improved security for users make it well worth it. As browser support for Trusted Types grows, this technology is set to become an essential tool in the web developer's security toolkit.