CSS (Cascading Style Sheets) can be a powerful tool in web development, but there are common blunders that many developers make that can lead to frustration and unexpected results. One of the most common mistakes is not utilizing the box model correctly. When developers misunderstand how margins, borders, and padding interact, it can lead to layout issues that require a lot of extra time to fix. Another frequent error is using IDs for styling instead of classes. While IDs are unique, they limit your flexibility in reusing styles across different elements, making your CSS unnecessarily cluttered.

Another major blunder is the overuse of !important within your stylesheets. This rule can lead to specificity wars, where you find yourself adding more and more specificity to override previously declared styles, which ultimately makes your CSS harder to read and maintain. Additionally, ignoring browser compatibility can cause your website to look different across various devices, leading to a subpar user experience. Remember, it's crucial to test your CSS in multiple browsers to ensure a consistent appearance.

JavaScript is a powerful language that has revolutionized web development, but even the most seasoned developers can stumble into common pitfalls that leave them questioning their life choices. One of the biggest mistakes is not understanding the scope of variables. For example, using a variable without declaring it can lead to unexpected behaviors due to JavaScript's automatic global variable creation. This can result in hard-to-debug situations where a variable changes unexpectedly, leading to bizarre logic errors that can waste hours of your time.

Another prevalent mistake is the misuse of the this keyword, which can be confusing even for experienced JavaScript developers. Without a clear grasp of how this works in different contexts, developers often find themselves lost in a maze of function calls. When using arrow functions, for instance, this can refer to the parent context instead of the function's own context, leading to unexpected outcomes. Keeping track of how this operates can save you from countless headaches and make your code much more predictable.

Many website owners often wonder, why does my website look different on every browser? The answer lies in the fact that different web browsers, such as Chrome, Firefox, Safari, and Edge, render HTML and CSS in slightly different ways. This means that the same code can produce varying results depending on the user's browser and its version. Factors like browser compatibility, rendering engines, and the way various browsers interpret CSS rules can lead to discrepancies in layout, fonts, and overall appearance.

Additionally, responsive design considerations come into play. When designing a website, developers use various techniques to ensure it looks good across multiple devices and screen sizes. However, some browsers may handle specific media queries or flexbox layouts differently, which can contribute to the inconsistent appearance of a website. As a result, regular testing across multiple browsers becomes essential to ensure a uniform user experience, helping to answer the question: why does my website look different on every browser?