Why do browsers only support some types of inline styles?

When working with HTML and CSS, there may be situations that appear one after another where the browser only supports some styles inline, causing complications or issues. This question about why browsers only recognize certain inline styles can be complex, but if we look at browser performance, this issue becomes a bit clearer.

Browsers use a standard model for rendering web pages, known as the DOM (Document Object Model). Any change in this model, such as adding an inline style, can cause the page to re-render, which may not be ideal for website performance. Certain styles in the DOM model have more significant effects and for this reason, they tend to attract more browser attention.

It’s important to note that browsers may internally adjust their performance and loading speed methods based on messages regarding specific style changes. For instance, changes related to inline styles relevant to display (like display), dimensions (like width and height), and position (like position) may be given more attention.

Other inline styles may have more management options, such as external or internal CSS, allowing better management. For this reason, browsers may suggest you use a more efficient approach than just using inline styles.

Furthermore, examples of utilizing inline styles and points to remember while using them will be stated here. With this example and detailed explanations, you can gain a better understanding of this topic.

<!-- An example HTML with inline styles -->
<div style="background-color: blue; width: 100px; height: 100px;">
    <p style="color: white;">This is a test block</p>
</div>