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Block-level HTML elements are elements that create block-level boxes in the HTML document's flow. They typically start on a new line and take up the full available width of their parent container by default. Block-level elements are often used for larger structural components of a webpage, such as paragraphs, headings, divs, sections, lists, and more.
Here are some common examples of block-level elements:
<p>: Represents a paragraph of text.<h1>to<h6>: Represents headings of different levels.<div>: Represents a generic block-level container.<section>: Represents a thematic grouping of content.<ul>and<ol>: Represent unordered and ordered lists, respectively.<li>: Represents individual list items within a list.<table>: Represents a table structure.<form>: Represents a form for user input.<header>,<footer>,<nav>,<article>: HTML5 semantic elements for specific sections of a webpage.
Block-level elements can contain other block-level elements, as well as inline elements (such as <span>, <em>, <strong>) and text content.
By default, block-level elements have certain rendering properties, such as line breaks before and after the element and taking up the full width available in their parent container. However, these rendering properties can be modified using CSS to control layout, positioning, and styling.
In contrast to block-level elements, there are also inline-level elements, which do not start on a new line and occupy only the space necessary for their content. Inline elements include <a>, <span>, <img>, <strong>, <em>, and more.
Understanding the distinction between block-level and inline elements is crucial for effectively structuring and styling web pages, as it determines how elements flow and interact with each other within the document.