What is true about validating code when using a GUI editor to develop a Web site?

When developing a website using a GUI editor, it is true that most of these tools either come with native validation features or provide seamless access to external validation tools. This is a key aspect of how GUI editors enhance the development experience. The integration of validation tools allows developers to check their markup for errors and ensure it adheres to standards without having to switch back and forth between the editor and a separate validation tool.

GUI editors prioritize user experience and often cater to developers who may not be as familiar with coding intricacies. By providing built-in validation, these editors help highlight issues in real-time, such as HTML or CSS errors, which is particularly beneficial for catching mistakes early in the development process.

In contrast, the other statements fail to accurately represent the capabilities of GUI editors. While some GUI editors may not have robust validation features, affirming that most don't support validation overlooks the advancements made in these tools. Similarly, the notion that code validation is unnecessary when using GUI editors lacks context, as validation plays a crucial role in ensuring that the website functions and renders correctly across different browsers and devices. Lastly, stating that validation only applies to coding in text editors is misleading, as validation is essential for all web development environments, including GUI editors.