An HTML document is composed of several crucial elements that define its layout: There are several crucial elements: 1. : This tag declares the document as an HTML5 file. 2. : The main container tag that includes everything on the webpage. 3. : This section holds the page's metadata and other important information, like links to CSS stylesheets or JavaScript files. 4.: Specifies the title of the page, which shows up on the browser’s tab. 5.: Contains all the visible content displayed on the webpage, such as text, images, and interactive elements.Example of a Simple HTML Structure:

Welcome!
This is a basic webpage layout.