Detailed explanation of the difference between inline elements and block-level elements-CSS Tutorial-php.cn

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Detailed explanation of the difference between inline elements and block-level elements

迷茫

Mar 25, 2017 am 10:46 AM

difference

1. The difference between inline elements and block-level elements

1. Inline elements will not occupy the entire line and are arranged in a straight line. They are all on the same line, arranged horizontally;

Block-level elements will occupy one line, arranged vertically.

　2. Block-level elements can contain inline elements and block-level elements; inline elements cannot contain block-level elements.

3. The difference between the attributes of inline elements and block-level elements is mainly due to the box model attributes. The width setting of inline elements is invalid, the height is invalid (line-height can be set), and the margin up and down is invalid. , padding up and down is invalid.

2. Conversion of inline elements and block-level elements

Conversion of inline elements For block elements: display:block;

Block elements are converted into inline elements ： display:inline;

##3. Question extension

Question description: Why can the width and height of inline elements such as img and input be set?

Detailed answer:

Elements are the basis of the document structure. In CSS, each element generates a box (box, also translated as "box") that contains the content of the element. But different elements will be displayed differently. For example,

and

are different, and and
are also different. Different types are specified for different elements in the document type definition (DTD), which is one of the reasons why DTD is important to documents.
　
1. Replaceable and non-replaceable elements
From the characteristics of the element itself, it can be divided into replaceable and non-replaceable elements.
a) Replace element
Replacement element means that the browser determines the specific display content of the element based on its tag and attributes.
　For example, the browser will read the image information and display it based on the value of the src attribute of the tag, but if you view the (X)HTML code, you cannot see the actual content of the image; another example Determine whether to display an input box, radio button, etc. based on the type attribute of the tag.
　　(X), , , <select>, <object> in HTML are all replacement elements. These elements often have no actual content, that is, an empty element, for example: <p></p>　　<img src="cat.jpg" /><p>　　<input type="submit" name="Submit " value="Submit" /></p> <p>　 The browser will display these elements based on their tag type and attributes. Replaceable elements also generate boxes in their display. <br></p> b) Non-replaceable elements <p></p> Most elements of (X)HTML are non-replaceable elements, that is, their content is directly displayed to the user (such as a browser). For example: <p></p>　　<p>Paragraph content</p><p></p>　 Paragraph<p> is a non-replaceable element, and the text "Paragraph content" is fully displayed. <p></p>　2. Display elements<p></p> In addition to the classification methods of replaceable elements and non-replaceable elements, elements in CSS 2.1 also have other classification methods: block-level elements (block-level) and inline Element (inline-level, also translated as "inline" element). <p></p>　a) Block-level elements<p></p>　　The most obvious feature of an element that is visually formatted as a block is that it fills the content area of its parent element horizontally by default, and on both its left and right sides Block-level elements are on their own line by default if there are no other elements. <p></p> Typical block-level elements are: <p>, <p>, <h1> to <h6>, and so on. <p></p> 　　Elements that are floated (float attribute, can float to the left or right) through CSS and set the display attribute to "block" or "list-item" are all block-level elements. . <p></p> <p>　 But floating elements are special. Due to floating, there may be other elements next to them. And "list-item" (list item <li>) will generate a dot symbol or numeric sequence in front of it. </p> <p>b) Inline elements</p> <p>Inline elements do not form a new content block, that is, there can be other elements around them, such as <a>, <span>, <strong>, etc., They are all typical inline-level elements. </p> <p> 　　 Elements whose display attribute is equal to "inline" are all inline elements. Almost all replaceable elements are inline elements, such as <img>, <input>, etc. </p> <p> However, the type of elements is not fixed. By setting the display attribute of CSS, inline elements can be changed into block-level elements, and block-level elements can also be changed into inline elements. </p> <p><span style="font-family: Microsoft YaHei"> 3. Conclusion: </span></p> <p><span style="font-family: 宋体"> Replacement elements generally have intrinsic dimensions, so they have width and height, which can be set. For example, if you do not specify the width and height of the img, it will be displayed according to its intrinsic size, which is the width and height of the image when it is saved. </span></p> <p><span style="font-family: 宋体">For form elements, browsers also have default styles, including width and height. </span></p><p>The above is the detailed content of Detailed explanation of the difference between inline elements and block-level elements. For more information, please follow other related articles on the PHP Chinese website!</p> </div> </div> <div class="wzconShengming_sp"> <div class="bzsmdiv_sp">Statement of this Website</div> <div>The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. 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this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/202308/17/2023081711295328733.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="What are inline elements and block-level elements?" /> </a> <a href="https://www.php.cn/faq/592543.html" title="What are inline elements and block-level elements?" class="phphistorical_Version2_mids_title">What are inline elements and block-level elements?</a> <span class="Articlelist_txts_time">Aug 17, 2023 am 11:33 AM</span> <p class="Articlelist_txts_p">Inline elements include div, p, h1-h6, ul, ol, li, table, form, etc.; block-level elements include span, a, img, strong, em, input, label, etc. The characteristics of the two elements: 1. Inline elements will occupy a row, automatically fill the width of the parent container, can set width, height, inner and outer margins and other attributes, and can contain other block-level elements and inline elements; 2. Inline elements will not It will occupy an exclusive line, the width and height are determined by the content, and the inner and outer margins only affect the arrangement of the elements themselves, etc.</p> </div> <div class="phphistorical_Version2_mids"> <a href="https://www.php.cn/faq/470675.html" title="What are html inline elements and block elements?" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/202102/20/2021022015575660951.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="What are html inline elements and block elements?" /> </a> <a href="https://www.php.cn/faq/470675.html" title="What are html inline elements and block elements?" class="phphistorical_Version2_mids_title">What are html inline elements and block elements?</a> <span class="Articlelist_txts_time">Feb 20, 2021 pm 04:03 PM</span> <p class="Articlelist_txts_p">HTML inline elements include: a (anchor element), b (bold), br (line break), code, em (emphasis), font (font setting), i (italic), img (picture), input (input box) ), span, strong (bold emphasis), textarea, u, etc.; block elements include: address (address), blockquote (block quote), center (center-aligned block), div, h1~h6 (title), hr ( Horizontal dividing line), p, ul, ol, etc.</p> </div> <div class="phphistorical_Version2_mids"> <a href="https://www.php.cn/faq/634793.html" title="The difference between inline elements and block-level elements: an in-depth understanding of element classification in HTML" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/000/000/164/170329687399445.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="The difference between inline elements and block-level elements: an in-depth understanding of element classification in HTML" /> </a> <a href="https://www.php.cn/faq/634793.html" title="The difference between inline elements and block-level elements: an in-depth understanding of element classification in HTML" class="phphistorical_Version2_mids_title">The difference between inline elements and block-level elements: an in-depth understanding of element classification in HTML</a> <span class="Articlelist_txts_time">Dec 23, 2023 am 10:01 AM</span> <p class="Articlelist_txts_p">The difference between inline elements and block-level elements: In-depth understanding of the classification of elements in HTML In HTML, elements can be divided into two categories: inline elements and block-level elements. Understanding their differences is very important to correctly master the layout and style of HTML. This article will provide an in-depth understanding of the characteristics of inline elements and block-level elements, and provide specific code examples. Inline elements Inline elements are elements that are displayed inline by default in HTML documents. They do not occupy an entire row, but appear closely within a row based on how the document flow is arranged. Common in the industry</p> </div> <div class="phphistorical_Version2_mids"> <a href="https://www.php.cn/faq/619476.html" title="What is the difference between inline elements and block-level elements?" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/202310/16/2023101609503858496.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="What is the difference between inline elements and block-level elements?" /> </a> <a href="https://www.php.cn/faq/619476.html" title="What is the difference between inline elements and block-level elements?" class="phphistorical_Version2_mids_title">What is the difference between inline elements and block-level elements?</a> <span class="Articlelist_txts_time">Oct 16, 2023 am 09:51 AM</span> <p class="Articlelist_txts_p">There are five differences between inline elements and block-level elements: "box model", "arrangement", "content display", "relative position" and "default size": 1. Inline elements do not generate independent boxes, width and height Determined by the content, block-level elements will generate an independent rectangular frame, and attributes such as width, height, margins, and padding can be set; 2. Inline elements are arranged horizontally on the same line, while block-level elements will be pressed from top to bottom. Arrange in order; 3. Inline elements cannot contain block-level elements, while block-level elements can contain other block-level elements and inline elements.</p> </div> <div class="phphistorical_Version2_mids"> <a href="https://www.php.cn/faq/680335.html" title="The margin attribute does not affect inline elements" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/000/000/164/170824539359008.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="The margin attribute does not affect inline elements" /> </a> <a href="https://www.php.cn/faq/680335.html" title="The margin attribute does not affect inline elements" class="phphistorical_Version2_mids_title">The margin attribute does not affect inline elements</a> <span class="Articlelist_txts_time">Feb 18, 2024 pm 04:36 PM</span> <p class="Articlelist_txts_p">The effect of margin on inline elements is different from that of block-level elements. In inline elements, the margin attribute only affects the vertical top and bottom margins, not the horizontal left and right margins. For example, if there is a paragraph element in HTML, we can set some styles for it and observe the effect of the margin attribute on it. The HTML code looks like this:</p> </div> <div class="phphistorical_Version2_mids"> <a href="https://www.php.cn/faq/619478.html" title="What are the inline elements and block-level elements in html?" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/202310/16/2023101609573984528.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="What are the inline elements and block-level elements in html?" /> </a> <a href="https://www.php.cn/faq/619478.html" title="What are the inline elements and block-level elements in html?" class="phphistorical_Version2_mids_title">What are the inline elements and block-level elements in html?</a> <span class="Articlelist_txts_time">Oct 16, 2023 am 09:57 AM</span> <p class="Articlelist_txts_p">Commonly used inline elements and block-level elements in HTML are: 1. Block-level elements include semantics such as <div>, <p>, <ul>, <ol>, <li>, <h1>~<h6>, and <header>. tags; 2. Inline elements include tags such as <span>, <a>, <strong>, <em>, <img>, and <input>.</p> </div> <div class="phphistorical_Version2_mids"> <a href="https://www.php.cn/faq/634938.html" title="Detailed explanation of usage scenarios and methods of CSS inline elements and block-level elements" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/000/000/164/170331236737120.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="Detailed explanation of usage scenarios and methods of CSS inline elements and block-level elements" /> </a> <a href="https://www.php.cn/faq/634938.html" title="Detailed explanation of usage scenarios and methods of CSS inline elements and block-level elements" class="phphistorical_Version2_mids_title">Detailed explanation of usage scenarios and methods of CSS inline elements and block-level elements</a> <span class="Articlelist_txts_time">Dec 23, 2023 pm 02:19 PM</span> <p class="Articlelist_txts_p">Detailed explanation of CSS inline elements and block-level elements: Explore their application scenarios and usage methods In CSS, elements can be divided into two types based on their display characteristics: inline elements and block-level elements. For web developers, it is very important to understand these two concepts, because their different characteristics determine their application scenarios and usage methods. Inline elements are elements that occupy only one line in a web page. Common inline elements include <span>, <img>, and <input></p> </div> <div class="phphistorical_Version2_mids"> <a href="https://www.php.cn/faq/637108.html" title="Introduction and differences between HTML5 inline elements and block-level elements" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/000/000/164/170374666589320.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="Introduction and differences between HTML5 inline elements and block-level elements" /> </a> <a href="https://www.php.cn/faq/637108.html" title="Introduction and differences between HTML5 inline elements and block-level elements" class="phphistorical_Version2_mids_title">Introduction and differences between HTML5 inline elements and block-level elements</a> <span class="Articlelist_txts_time">Dec 28, 2023 pm 02:57 PM</span> <p class="Articlelist_txts_p">Introduction and differences between HTML5 inline elements and block-level elements HTML5 is a markup language used to create the structure of web pages. In HTML5, elements are divided into two types: inline elements and block elements. Introduction to inline elements: Inline elements are elements that appear as a line in the document flow. They only take up space for their own content and do not disrupt the overall layout of the page. Inline elements can contain text, other inline elements, or parts of block-level elements</p> </div> </div> <a href="https://www.php.cn/web-designer.html" class="phpgenera_Details_mainL4_botton"> <span>See all articles</span> <img src="/static/imghw/down_right.png" alt="" /> </a> </div> </div> </div> </main> <footer> <div class="footer"> <div class="footertop"> <img src="/static/imghw/logo.png" alt=""> <p>Public welfare online PHP training，Help PHP learners grow quickly！</p> </div> <div class="footermid"> <a href="https://www.php.cn/about/us.html">About us</a> <a href="https://www.php.cn/about/disclaimer.html">Disclaimer</a> <a href="https://www.php.cn/update/article_0_1.html">Sitemap</a> </div> <div class="footerbottom"> <p> © php.cn All rights reserved </p> </div> </div> </footer> <input type="hidden" id="verifycode" value="/captcha.html"> <script>layui.use(['element', 'carousel'], function () {var element = layui.element;$ = layui.jquery;var carousel = layui.carousel;carousel.render({elem: '#test1', width: '100%', height: '330px', arrow: 'always'});$.getScript('/static/js/jquery.lazyload.min.js', function () {$("img").lazyload({placeholder: "/static/images/load.jpg", effect: "fadeIn", threshold: 200, skip_invisible: false});});});</script> <script src="/static/js/common_new.js"></script> <script type="text/javascript" src="/static/js/jquery.cookie.js?1743933595"></script> <script src="https://vdse.bdstatic.com//search-video.v1.min.js"></script> <link rel='stylesheet' id='_main-css' href='/static/css/viewer.min.css?2' type='text/css' media='all' /> <script type='text/javascript' src='/static/js/viewer.min.js?1'></script> <script type='text/javascript' src='/static/js/jquery-viewer.min.js'></script> <script type="text/javascript" src="/static/js/global.min.js?5.5.53"></script> <script> var _paq = window._paq = window._paq || []; /* tracker methods like "setCustomDimension" should be called before "trackPageView" */ _paq.push(['trackPageView']); _paq.push(['enableLinkTracking']); (function () { var u = "https://tongji.php.cn/"; _paq.push(['setTrackerUrl', u + 'matomo.php']); _paq.push(['setSiteId', '9']); var d = document, g = d.createElement('script'), s = d.getElementsByTagName('script')[0]; g.async = true; g.src = u + 'matomo.js'; s.parentNode.insertBefore(g, s); })(); </script> <script> // top layui.use(function () { var util = layui.util; util.fixbar({ on: { mouseenter: function (type) { layer.tips(type, this, { tips: 4, fixed: true, }); }, mouseleave: function (type) { layer.closeAll("tips"); }, }, }); }); document.addEventListener("DOMContentLoaded", (event) => { // 定义一个函数来处理滚动链接的点击事件 function setupScrollLink(scrollLinkId, targetElementId) { const scrollLink = document.getElementById(scrollLinkId); const targetElement = document.getElementById(targetElementId); if (scrollLink && targetElement) { scrollLink.addEventListener("click", (e) => { e.preventDefault(); // 阻止默认链接行为 targetElement.scrollIntoView({ behavior: "smooth" }); // 平滑滚动到目标元素 }); } else { console.warn( `Either scroll link with ID '${scrollLinkId}' or target element with ID '${targetElementId}' not found.` ); } } // 使用该函数设置多个滚动链接 setupScrollLink("Article_Details_main1L2s_1", "article_main_title1"); setupScrollLink("Article_Details_main1L2s_2", "article_main_title2"); setupScrollLink("Article_Details_main1L2s_3", "article_main_title3"); setupScrollLink("Article_Details_main1L2s_4", "article_main_title4"); setupScrollLink("Article_Details_main1L2s_5", "article_main_title5"); setupScrollLink("Article_Details_main1L2s_6", "article_main_title6"); // 可以继续添加更多的滚动链接设置 }); window.addEventListener("scroll", function () { var fixedElement = document.getElementById("Article_Details_main1Lmain"); var scrollTop = window.scrollY || document.documentElement.scrollTop; // 兼容不同浏览器 var clientHeight = window.innerHeight || document.documentElement.clientHeight; // 视口高度 var scrollHeight = document.documentElement.scrollHeight; // 页面总高度 // 计算距离底部的距离 var distanceToBottom = scrollHeight - scrollTop - clientHeight; // 当距离底部小于或等于300px时，取消固定定位 if (distanceToBottom <= 980) { fixedElement.classList.remove("Article_Details_main1Lmain"); fixedElement.classList.add("Article_Details_main1Lmain_relative"); } else { // 否则，保持固定定位 fixedElement.classList.remove("Article_Details_main1Lmain_relative"); fixedElement.classList.add("Article_Details_main1Lmain"); } }); </script> </body> </html>