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All three files must be in the same directory — a folder on your computer. I will call the main HTML file index, the main CSS file styles, and the main JavaScript file scripts. A JavaScript file determines the dynamic and interactive elements on the page. It determines what happens when users click, hover, or type within certain elements. The lowest hanging fruit of web performance is often media optimization. Serving different media files based on each user agent’s capability, size, and pixel density is possible.

They need to be referenced in the HTML file in order to be loaded. That is why, in the diagram above, the folder itself is the same. But the HTML file and the code that links it to the other files are different. Let’s call the new building apartment.html, and the new CSS will be fancy.css. Since we have an entirely new HTML file, we are not simply linking up a new CSS file.

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APIs are ready-made sets of code building blocks that allow a developer to implement programs that would otherwise be hard or impossible to implement. CSS can serve as a which of the following is well versed in html5, javascript, and css? great starting point for those new to coding. If you’re planning to get into website development or design, you should brush up on your HTML, JavaScript and Bootstrap.

which of the following is well versed in html5, javascript, and css?

A web developer can use HTML5 for developing photo sites, web forums, and advanced mapping applications. HTML5 is the 5th version of HTML version 1.0 with support for more tags and features. Technically its termed HTML version 5.0, but colloquially it called HTML5. As your JavaScript skills grow, your websites will enter a new dimension of power and creativity. It’s outside the scope of this article—as a light introduction to JavaScript—to present the details of how the core JavaScript language is different from the tools listed above. You can learn more in MDN’s JavaScript learning area, as well as in other parts of MDN.

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However, each challenge happens in a sandbox environment, and does not test you on multiple languages at once. JavaScript, when used properly, can allow for interactive and immersive web experiences — or it can significantly harm download time, render time, in-app performance, battery life, and user experience. This article outlines some JavaScript best practices that should be considered to ensure even complex content is as performant as possible. This innovation acknowledges that different browsers support different styling properties, and that individual styles are not mission critical. The resilience of CSS means more users get access to a functional interface. These styles only apply to disabled buttons that are already in the DOM.