What is no longer necessary when using HTML5 to develop Web pages?

Using HTML5 has introduced several native capabilities that streamline web development, particularly in handling multimedia. Specifically, one major advancement is the support for audio and video embedding without the need for third-party plug-ins. In the past, developers often relied on various plug-ins, like Flash, to incorporate video content on web pages. However, HTML5 offers the <video> and <audio> elements, enabling easy integration of media directly into the HTML markup. This transition not only simplifies the development process but also enhances compatibility across modern web browsers, since no additional installation is necessary for users.

The other aspects of web development, such as using a text editor, applying CSS, and employing JavaScript, remain important regardless of the advancements in HTML. These components are fundamental for creating well-structured, styled, and interactive web applications, thus they continue to play essential roles in web development with HTML5.