有名的公司一欄<\/p>
Using this code we can easily draw the dom tree. <\/p>
<\/p>
<\/p>
When you see this DOM tree, do you suddenly feel that the amount of information is particularly large? It is very simple, because it is a tree, so there are some trees Characteristics, such as \"child node\", \"father node\", <\/p>
\"sibling node\", \"first left child\", \"last left child\", etc., correspond to the various things I will talk about later. In this case, let’s see if it feels good to see the html being stripped naked~~~~ <\/p>
1: Child node <\/p>
Finding child node, essentially there are two types, Really only find \"child nodes\", \"find all children (including descendants)\" <\/p>
<1> Descendant Selector <\/p>
First look at the html below, I think you can draw it easily Now that the DOM tree is out, the next question is how to paint all descendant spans in the body with red. <\/p>
<\/title> <style type=\"text\/css\"> body span { color: red; } <\/style><\/head><body> <h1><a href="http://miracleart.cn/">国产av日韩一区二区三区精品,成人性爱视频在线观看,国产,欧美,日韩,一区,www.成色av久久成人,2222eeee成人天堂</a></h1> <span>我是span1<\/span> <ul> <li> <ul><span>我是span2<\/span><\/ul> <\/li> <\/ul><\/body><\/html><\/pre> <p> <\/p> <p>2. Child selector <\/p> <p><1> ”>” How to play <\/p> <p>This is also the second situation I mentioned , it really only looks for child nodes. It’s very simple in CSS, just use the > sign. Isn’t it interesting? It’s the same way as jquery, right? <\/p> <pre class='brush:php;toolbar:false;'><html xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\"><head> <meta http-equiv=\"Content-Type\" content=\"text\/html; charset=utf-8\" \/> <title><\/title> <style type=\"text\/css\"> body > span { color: red; } <\/style><\/head><body> <span>我是span1<\/span> <ul> <li> <ul><span>我是span2<\/span><\/ul> <\/li> <\/ul><\/body><\/html><\/pre> <p> <\/p> <p><2> \"Pseudo-selector\" gameplay <\/p> <p>In addition to the above gameplay, you can also use the \"pseudo-selector\" gameplay in CSS3. It’s so powerful. The next article will explain it specifically. Here I only introduce one: nth-child usage. If <\/p> <p> you have played with jquery, nothing will be a problem. <\/p> <pre class='brush:php;toolbar:false;'><!DOCTYPE html><html xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\"><head> <meta http-equiv=\"Content-Type\" content=\"text\/html; charset=utf-8\" \/> <title><\/title> <style type=\"text\/css\"> body > span:nth-child(1) { color: red; } <\/style><\/head><body> <span>我是span1<\/span> <span>我是span2<\/span> <ul> <li> <ul><span>我是span3<\/span><\/ul> <\/li> <\/ul><\/body><\/html><\/pre> <p> <\/p> <p>3. Sibling nodes <\/p> <p>Sibling nodes are also easy to understand. It can be solved by using \" \" in css. You can see that I succeeded below Draw the second p in red. <\/p> <pre class='brush:php;toolbar:false;'><!DOCTYPE html><html xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\"><head> <meta http-equiv=\"Content-Type\" content=\"text\/html; charset=utf-8\" \/> <title><\/title> <style type=\"text\/css\"> .test + p { color:red; } <\/style><\/head><body> <p class=\"test\">我是第一個(gè)段落<\/p> <p>我是第二個(gè)段落<\/p><\/body><\/html><\/pre> <p> <\/p> <p>4. Attribute selector <\/p> <p>If you have played with jquery, I want to be very clear about this attribute selector. First, look at an example. 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/> <a href="http://miracleart.cn/div-tutorial.html" class="phpgenera_Details_mainL1a">HTML Tutorial</a> <img src="/static/imghw/top_right.png" alt="" /> <span>CSS Journey (2): How to understand various selectors more deeply_html/css_WEB-ITnose</span> </div> <div id="377j5v51b" class="Articlelist_txts"> <div id="377j5v51b" class="Articlelist_txts_info"> <h1 class="Articlelist_txts_title">CSS Journey (2): How to understand various selectors more deeply_html/css_WEB-ITnose</h1> <div id="377j5v51b" class="Articlelist_txts_info_head"> <div id="377j5v51b" class="author_info"> <a href="http://miracleart.cn/member/887227.html" class="author_avatar"> <img class="lazy" data-src="https://img.php.cn/upload/avatar/000/887/227/63bb7851c9547215.jpg" src="/static/imghw/default1.png" alt="WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB"> </a> <div id="377j5v51b" class="author_detail"> <a href="http://miracleart.cn/member/887227.html" class="author_name">WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB</a> </div> </div> </div> <span id="377j5v51b" class="Articlelist_txts_time">Jun 24, 2016 am 11:42 AM</span> </div> </div> <hr /> <div id="377j5v51b" class="article_main php-article"> <div id="377j5v51b" class="article-list-left detail-content-wrap content"> <ins class="adsbygoogle" style="display:block; text-align:center;" data-ad-layout="in-article" data-ad-format="fluid" data-ad-client="ca-pub-5902227090019525" data-ad-slot="3461856641"> </ins> <p class="sougouContent"> </p> <p></p> Original source: First-line coder <br> <p><br> <br> In the last article we talked about why we should use css. In this article we will start with the selector. Everyone knows The browser will parse the remote HTML into a dom model. With the dom model, the html will become an xml format. Otherwise, it will be a bunch of "messy" strings. In this case, no one will know what it is, and js will not There is no way to getElementById, so when the browser parses it into a dom structure, the browser will easily find the corresponding position in the dom structure according to the selectors of various CSS rules. Then the next problem will naturally be serious, then It is necessary to understand the dom model in depth. </p> <p>1: Understanding the Dom model </p> <p>First we look at the code below. </p> <pre class='brush:php;toolbar:false;'><!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title></title></head><body> <p>有名的公司一欄</p> <hr /> <ul> <li>百度</li> <li>新浪</li> <li>阿里</li> </ul></body></html></pre> <p>Using this code we can easily draw the dom tree. </p> <p> </p> <p> </p> <p>When you see this DOM tree, do you suddenly feel that the amount of information is particularly large? It is very simple, because it is a tree, so there are some trees Characteristics, such as "child node", "father node", </p> <p> "sibling node", "first left child", "last left child", etc., correspond to the various things I will talk about later. In this case, let’s see if it feels good to see the html being stripped naked~~~~ </p> <p>1: Child node </p> <p>Finding child node, essentially there are two types, Really only find "child nodes", "find all children (including descendants)" </p> <p><1> Descendant Selector </p> <p> First look at the html below, I think you can draw it easily Now that the DOM tree is out, the next question is how to paint all descendant spans in the body with red. </p> <pre class='brush:php;toolbar:false;'><!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title></title> <style type="text/css"> body span { color: red; } </style></head><body> <span>我是span1</span> <ul> <li> <ul><span>我是span2</span></ul> </li> </ul></body></html></pre> <p> </p> <p>2. Child selector </p> <p><1> ”>” How to play </p> <p>This is also the second situation I mentioned , it really only looks for child nodes. It’s very simple in CSS, just use the > sign. Isn’t it interesting? It’s the same way as jquery, right? </p> <pre class='brush:php;toolbar:false;'><html xmlns="http://www.w3.org/1999/xhtml"><head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title></title> <style type="text/css"> body > span { color: red; } </style></head><body> <span>我是span1</span> <ul> <li> <ul><span>我是span2</span></ul> </li> </ul></body></html></pre> <p> </p> <p><2> "Pseudo-selector" gameplay </p> <p>In addition to the above gameplay, you can also use the "pseudo-selector" gameplay in CSS3. It’s so powerful. The next article will explain it specifically. Here I only introduce one: nth-child usage. If </p> <p> you have played with jquery, nothing will be a problem. </p> <pre class='brush:php;toolbar:false;'><!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title></title> <style type="text/css"> body > span:nth-child(1) { color: red; } </style></head><body> <span>我是span1</span> <span>我是span2</span> <ul> <li> <ul><span>我是span3</span></ul> </li> </ul></body></html></pre> <p> </p> <p>3. Sibling nodes </p> <p>Sibling nodes are also easy to understand. It can be solved by using " " in css. You can see that I succeeded below Draw the second p in red. </p> <pre class='brush:php;toolbar:false;'><!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title></title> <style type="text/css"> .test + p { color:red; } </style></head><body> <p class="test">我是第一個(gè)段落</p> <p>我是第二個(gè)段落</p></body></html></pre> <p> </p> <p>4. Attribute selector </p> <p>If you have played with jquery, I want to be very clear about this attribute selector. First, look at an example. I want to find name= Mark the p element of test in red. </p> <pre class='brush:php;toolbar:false;'><html xmlns="http://www.w3.org/1999/xhtml"><head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title></title> <style type="text/css"> p[name='test'] { color: red; } </style> <script src="Scripts/jquery-1.10.2.js"></script></head><body> <p name="test">我是第一個(gè)段落</p> <p>我是第二個(gè)段落</p></body></html></pre> <p> </p> <p>Up to now, do you feel that the gameplay is exactly the same as jquery, and the feeling is getting stronger and stronger, and it has reached the realm of "you understand". </p> <p>2: Speculation on the internal mechanism of CSS </p> <p>As mentioned at the beginning of the article, the browser will apply the style of this tag to the "tag" specified in the dom based on the "tag" defined in the css. tag ", for example, I defined a </p> <p>p style in CSS, but how can the browser find all the p elements in the dom? ? ? Because of the closed source, we cannot know its internal mechanism, but in jquery, we may have a glimpse </p> <p>2, because the selector usage that can be displayed by css can be found in jquery. Then I can't wait to see how jquery extracts my various selector writing methods. Let's take a look at the source code. </p> <pre class='brush:php;toolbar:false;'><!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title></title> <style type="text/css"> p[name='test'] { color: red; } </style> <script src="Scripts/jquery-1.10.2.js"></script> <script type="text/javascript"> $(document).ready(function () { $("p[name='test']").hide(); }); </script></head><body> <p name="test">我是第一個(gè)段落</p> <p>我是第二個(gè)段落</p></body></html></pre> <p> </p> <p>After searching in jquery, you can finally see that the native method of queryselectorAll is just called. You can also clearly see it in the console. Finally, The results of </p> <p> are the found p elements. To verify, I opened a console under the taobao page. </p> <p>Up to now, I have a rough guess, maybe at least under the chrome browser, the browser may also call the queryselectAll method in order to find the specified element in the dom. . . </p> <p>Okay, that’s about it. Understanding the DOM model is the key, so that we can understand the subsequent rendering behavior of the browser. </p> </div> </div> <div id="377j5v51b" class="wzconShengming_sp"> <div id="377j5v51b" 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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Optimize performance, reduce HTTP requests, use cache and optimize images, and ensure responsive design.</p> </div> <div id="377j5v51b" class="phphistorical_Version2_mids"> <a href="http://miracleart.cn/faq/1796819014.html" title="How can you ensure your HTML code is readable and maintainable?" 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/001/253/068/174948520268430.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="How can you ensure your HTML code is readable and maintainable?" /> </a> <a href="http://miracleart.cn/faq/1796819014.html" title="How can you ensure your HTML code is readable and maintainable?" class="phphistorical_Version2_mids_title">How can you ensure your HTML code is readable and maintainable?</a> <span id="377j5v51b" class="Articlelist_txts_time">Jun 10, 2025 am 12:06 AM</span> <p class="Articlelist_txts_p">Improve the readability and maintainability of HTML code can be achieved through the following steps: 1. Use semantic tags, such as, etc. to make the code structure clear and improve SEO effect; 2. Keep the code formatted and use consistent indentation and spaces; 3. Add appropriate comments to explain the code intention; 4. Avoid excessive nesting and simplify the structure; 5. Use external style sheets and scripts to keep the HTML concise.</p> </div> <div id="377j5v51b" class="phphistorical_Version2_mids"> <a href="http://miracleart.cn/faq/1796822239.html" title="How do I stay up-to-date with the latest HTML standards and best practices?" 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/001/253/068/175037959235285.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="How do I stay up-to-date with the latest HTML standards and best practices?" /> </a> <a href="http://miracleart.cn/faq/1796822239.html" title="How do I stay up-to-date with the latest HTML standards and best practices?" class="phphistorical_Version2_mids_title">How do I stay up-to-date with the latest HTML standards and best practices?</a> <span id="377j5v51b" class="Articlelist_txts_time">Jun 20, 2025 am 08:33 AM</span> <p class="Articlelist_txts_p">The key to keep up with HTML standards and best practices is to do it intentionally rather than follow it blindly. First, follow the summary or update logs of official sources such as WHATWG and W3C, understand new tags (such as) and attributes, and use them as references to solve difficult problems; second, subscribe to trusted web development newsletters and blogs, spend 10-15 minutes a week to browse updates, focus on actual use cases rather than just collecting articles; second, use developer tools and linters such as HTMLHint to optimize the code structure through instant feedback; finally, interact with the developer community, share experiences and learn other people's practical skills, so as to continuously improve HTML skills.</p> </div> <div id="377j5v51b" class="phphistorical_Version2_mids"> <a href="http://miracleart.cn/faq/1796821966.html" title="How do I use the element to represent the main content of a document?" 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/001/253/068/175034575284018.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="How do I use the element to represent the main content of a document?" /> </a> <a href="http://miracleart.cn/faq/1796821966.html" title="How do I use the element to represent the main content of a document?" class="phphistorical_Version2_mids_title">How do I use the element to represent the main content of a document?</a> <span id="377j5v51b" class="Articlelist_txts_time">Jun 19, 2025 pm 11:09 PM</span> <p class="Articlelist_txts_p">The reason for using tags is to improve the semantic structure and accessibility of web pages, make it easier for screen readers and search engines to understand page content, and allow users to quickly jump to core content. Here are the key points: 1. Each page should contain only one element; 2. It should not include content that is repeated across pages (such as sidebars or footers); 3. It can be used in conjunction with ARIA properties to enhance accessibility. Usually located after and before, it is used to wrap unique page content, such as articles, forms or product details, and should be avoided in, or in; to improve accessibility, aria-labeledby or aria-label can be used to clearly identify parts.</p> </div> <div id="377j5v51b" class="phphistorical_Version2_mids"> <a href="http://miracleart.cn/faq/1796821965.html" title="How do I create a basic HTML document?" 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/001/253/068/175034527243743.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="How do I create a basic HTML document?" /> </a> <a href="http://miracleart.cn/faq/1796821965.html" title="How do I create a basic HTML document?" class="phphistorical_Version2_mids_title">How do I create a basic HTML document?</a> <span id="377j5v51b" class="Articlelist_txts_time">Jun 19, 2025 pm 11:01 PM</span> <p class="Articlelist_txts_p">To create a basic HTML document, you first need to understand its basic structure and write code in a standard format. 1. Use the declaration document type at the beginning; 2. Use the tag to wrap the entire content; 3. Include and two main parts in it, which are used to store metadata such as titles, style sheet links, etc., and include user-visible content such as titles, paragraphs, pictures and links; 4. Save the file in .html format and open the viewing effect in the browser; 5. Then you can gradually add more elements to enrich the page content. Follow these steps to quickly build a basic web page.</p> </div> <div id="377j5v51b" class="phphistorical_Version2_mids"> <a href="http://miracleart.cn/faq/1796821968.html" title="How do I create checkboxes in HTML using the element?" 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/001/253/068/175034767289886.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="How do I create checkboxes in HTML using the element?" /> </a> <a href="http://miracleart.cn/faq/1796821968.html" title="How do I create checkboxes in HTML using the element?" class="phphistorical_Version2_mids_title">How do I create checkboxes in HTML using the element?</a> <span id="377j5v51b" class="Articlelist_txts_time">Jun 19, 2025 pm 11:41 PM</span> <p class="Articlelist_txts_p">To create an HTML checkbox, use the type attribute to set the element of the checkbox. 1. The basic structure includes id, name and label tags to ensure that clicking text can switch options; 2. Multiple related check boxes should use the same name but different values, and wrap them with fieldset to improve accessibility; 3. Hide native controls when customizing styles and use CSS to design alternative elements while maintaining the complete functions; 4. Ensure availability, pair labels, support keyboard navigation, and avoid relying on only visual prompts. The above steps can help developers correctly implement checkbox components that have both functional and aesthetics.</p> </div> <div id="377j5v51b" class="phphistorical_Version2_mids"> <a href="http://miracleart.cn/faq/1796820119.html" title="What is an HTML tag?" 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/001/253/068/174974618165612.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="What is an HTML tag?" /> </a> <a href="http://miracleart.cn/faq/1796820119.html" title="What is an HTML tag?" class="phphistorical_Version2_mids_title">What is an HTML tag?</a> <span id="377j5v51b" class="Articlelist_txts_time">Jun 13, 2025 am 12:36 AM</span> <p class="Articlelist_txts_p">HTMLtagsareessentialforstructuringwebpages.Theydefinecontentandlayoutusinganglebrackets,ofteninpairslikeand,withsomebeingself-closinglike.HTMLtagsarecrucialforcreatingstructured,accessible,andSEO-friendlywebpages.</p> </div> </div> <a href="http://miracleart.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 id="377j5v51b" class="footer"> <div id="377j5v51b" class="footertop"> <img src="/static/imghw/logo.png" alt=""> <p>Public welfare online PHP training，Help PHP learners grow quickly！</p> </div> <div id="377j5v51b" class="footermid"> <a href="http://miracleart.cn/about/us.html">About us</a> <a href="http://miracleart.cn/about/disclaimer.html">Disclaimer</a> <a href="http://miracleart.cn/update/article_0_1.html">Sitemap</a> </div> <div id="377j5v51b" class="footerbottom"> <p> ? 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