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Welcome<\/h1>\n <\/body>\n<\/html>\n\n\n\n\n \n Correct DOCTYPE<\/title>\n <\/head>\n <body> <h1><a href="http://www.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>\n <h1>Welcome<\/h1>\n <\/body>\n<\/html><\/pre><h3> Advanced Usage<\/h3><p> Some uncommon validation errors may be encountered when dealing with complex HTML structures. For example, nested form elements ( <code><form><\/code> ) can cause verification to fail because the HTML standard does not allow form nesting.<\/p><pre class='brush:php;toolbar:false;'> \n<form>\n <form>\n <input type=\"text\" name=\"username\">\n <\/form>\n<\/form>\n\n\n<form>\n <input type=\"text\" name=\"username\">\n<\/form><\/pre><h3> Common Errors and Debugging Tips<\/h3><ul><li> <strong>Unknown elements<\/strong> : Sometimes introducing custom elements or not introducing external libraries correctly can lead to validation errors. The solution is to make sure all elements are standard HTML tags, or to properly introduce external resources.<\/li><\/ul><pre class='brush:php;toolbar:false;'> \n<custom-element>This is a custom element<\/custom-element>\n\n\n<div data-custom=\"true\">This is a custom element<\/div><\/pre><ul><li> <strong>Character encoding error<\/strong> : If the character encoding declaration of the HTML document does not match the actual content, the verification tool will report an error. Make sure that the character encoding declaration in the <code><meta><\/code> tag is consistent with the encoding saved by the document.<\/li><\/ul><pre class='brush:php;toolbar:false;'> \n<meta charset=\"UTF-8\">\n\n\n\n<meta charset=\"GBK\">\n<\/pre><h2> Performance optimization and best practices<\/h2>\n<p> In actual projects, optimizing the HTML verification process can improve development efficiency and web page quality. Some of my best practices include:<\/p>\n<ul>\n<li><p> <strong>Using automation tools<\/strong> : such as HTMLHint or ESLint, you can check HTML code in real time during development to avoid verification errors.<\/p><\/li>\n<li><p> <strong>Regular verification<\/strong> : Regular HTML verification during project development to promptly discover and fix problems, rather than waiting until the end of the project.<\/p><\/li>\n<li><p> <strong>Code specification<\/strong> : Follow unified code specifications to ensure that the code style of team members is consistent and reduce the occurrence of verification errors.<\/p><\/li>\n<li><p> <strong>Test environment<\/strong> : Test web pages on different browsers and devices to ensure compatibility and consistency of verification results.<\/p><\/li>\n<\/ul>\n<p> Through these practices, I have successfully avoided common HTML verification errors in multiple projects, improving the quality and user experience of the web pages.<\/p>\n<p> During the HTML verification process, developers need to pay attention to the following points:<\/p>\n<ul>\n<li><p> <strong>Selection of verification tools<\/strong> : Different verification tools may have different feedback on the same error, and it is very important to choose a tool that suits your development environment.<\/p><\/li>\n<li><p> <strong>Error priority<\/strong> : Not all verification errors need to be fixed immediately. Repair priority should be reasonably arranged according to the actual situation of the project.<\/p><\/li>\n<li><p> <strong>Automation and manual combination<\/strong> : While automation tools can help us spot most errors, some complex verification errors may require manual inspection and repair.<\/p><\/li>\n<\/ul>\n<p> Through these experiences and suggestions, I hope it can help you better understand and deal with common errors in HTML verification and improve your front-end development skills.<\/p>\n<\/div><\/code>\n<\/li><\/ul>\n<\/div>"} </script> <meta http-equiv="Cache-Control" content="no-transform" /> <meta http-equiv="Cache-Control" content="no-siteapp" /> <script>var V_PATH="/";window.onerror=function(){ return true; };</script> </head> <body data-commit-time="2023-12-28T14:50:12+08:00" class="editor_body body2_2"> <link rel="stylesheet" type="text/css" href="/static/csshw/stylehw.css"> <header> <div id="377j5v51b" class="head"> <div id="377j5v51b" class="haed_left"> <div 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class="Article_Details_main1Lmain" id="Article_Details_main1Lmain"> <div id="377j5v51b" class="Article_Details_main1L1">Table of Contents</div> <div id="377j5v51b" class="Article_Details_main1L2" id="Article_Details_main1L2">  <div id="377j5v51b" class="Article_Details_main1L2s "> <a href="#introduction" title=" introduction" > introduction</a> </div> <div id="377j5v51b" class="Article_Details_main1L2s "> <a href="#Review-of-basic-knowledge" title=" Review of basic knowledge" > Review of basic knowledge</a> </div> <div id="377j5v51b" class="Article_Details_main1L2s "> <a href="#Core-concept-or-function-analysis" title=" Core concept or function analysis" > Core concept or function analysis</a> </div> <div id="377j5v51b" class="Article_Details_main1L2s "> <a href="#Definition-and-function-of-HTML-verification" title=" Definition and function of HTML verification" > Definition and function of HTML verification</a> </div> <div id="377j5v51b" class="Article_Details_main1L2s "> <a href="#How-it-works" title=" How it works" > How it works</a> </div> <div id="377j5v51b" class="Article_Details_main1L2s "> <a href="#Example-of-usage" title=" Example of usage" > Example of usage</a> </div> <div id="377j5v51b" class="Article_Details_main1L2s "> <a href="#Common-HTML-verification-errors" title=" Common HTML verification errors" > Common HTML verification errors</a> </div> <div id="377j5v51b" class="Article_Details_main1L2s "> <a href="#Advanced-Usage" title=" Advanced Usage" > Advanced Usage</a> </div> <div id="377j5v51b" class="Article_Details_main1L2s "> <a href="#Common-Errors-and-Debugging-Tips" title=" Common Errors and Debugging Tips" > Common Errors and Debugging Tips</a> </div> <div id="377j5v51b" class="Article_Details_main1L2s "> <a href="#Performance-optimization-and-best-practices" title=" Performance optimization and best practices" > Performance optimization and best practices</a> </div> </div> </div> </div> <div id="377j5v51b" class="Article_Details_main1M"> <div id="377j5v51b" class="phpgenera_Details_mainL1"> <a href="http://www.miracleart.cn/" title="Home" class="phpgenera_Details_mainL1a">Home</a> <img src="/static/imghw/top_right.png" alt="" /> <a href="http://www.miracleart.cn/web-designer.html" class="phpgenera_Details_mainL1a">Web Front-end</a> <img src="/static/imghw/top_right.png" alt="" /> <a href="http://www.miracleart.cn/div-tutorial.html" class="phpgenera_Details_mainL1a">HTML Tutorial</a> <img src="/static/imghw/top_right.png" alt="" /> <span>What are some common HTML validation errors?</span> </div> <div id="377j5v51b" class="Articlelist_txts"> <div id="377j5v51b" class="Articlelist_txts_info"> <h1 class="Articlelist_txts_title">What are some common HTML validation errors?</h1> <div id="377j5v51b" class="Articlelist_txts_info_head"> <div id="377j5v51b" class="author_info"> <a href="http://www.miracleart.cn/member/1468483.html" class="author_avatar"> <img class="lazy" data-src="https://img.php.cn/upload/avatar/000/000/001/66ea83d367651601.png" src="/static/imghw/default1.png" alt="Robert Michael Kim"> </a> <div id="377j5v51b" class="author_detail"> <a href="http://www.miracleart.cn/member/1468483.html" class="author_name">Robert Michael Kim</a> </div> </div> </div> <span id="377j5v51b" class="Articlelist_txts_time">May 18, 2025 am 12:09 AM</span> <div id="377j5v51b" class="Articlelist_txts_infos"> <span id="377j5v51b" class="Articlelist_txts_infoss on">HTML Verification</span> <span id="377j5v51b" class="Articlelist_txts_infoss ">HTML verification error</span> </div> </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>HTML verification is a process of checking whether HTML documents comply with W3C standards. Its role is to ensure the correct web structure and improve user experience and SEO results. Common verification errors include: 1. Unclosed tags, such as </p> <div> not closed; 2. Incorrect attributes, such as <img src="/static/imghw/default1.png" data-src="image.jpg" class="lazy" alt="What are some common HTML validation errors?" >'s src attribute is not quoted; 3. DOCTYPE declaration errors, causing the browser to render in weird mode; 4. Nested form elements cause verification to fail; 5. Unknown elements and character encoding errors. By using automation tools, regular verification, code specifications and multi-environment testing, the verification process can be optimized and web page quality can be improved.<h2 id="introduction"> introduction</h2> <p> In front-end development, HTML verification is a key step in ensuring web page quality and compatibility. Through HTML verification, we can ensure that our code complies with standards, thereby improving website accessibility and search engine optimization (SEO). This article will dig into common HTML verification errors, provide practical solutions, and share my experiences and lessons learned during the development process.</p> <h2 id="Review-of-basic-knowledge"> Review of basic knowledge</h2> <p> HTML verification refers to checking whether HTML documents comply with the standards set by W3C (World Wide Web Alliance). This process can be accomplished through various tools, such as the W3C Markup Validation Service. During the verification process, common errors include unclosed labels, incorrect attributes, and DOCTYPE declaration errors. These errors not only affect the display of web pages, but may also lead to compatibility issues between browsers.</p> <h2 id="Core-concept-or-function-analysis"> Core concept or function analysis</h2> <h3 id="Definition-and-function-of-HTML-verification"> Definition and function of HTML verification</h3> <p> HTML verification is a process of checking whether HTML documents comply with standard specifications. Its main function is to ensure the correct structure of the web page and improve user experience and SEO effect. For example, an unclosed tag may cause a browser parsing error, which affects the layout and functionality of the web page.</p> <h3 id="How-it-works"> How it works</h3> <p> The HTML verification tool parses HTML documents and compares them with the W3C standard. During the verification process, the tool will check the following aspects:</p> <ul> <li> The correctness and integrity of the label</li> <li> Correctness and format of attributes</li> <li> The correctness of the DOCTYPE statement</li> <li> Character encoding statement</li> </ul> <p> These checks help developers identify and fix potential issues, ensuring the quality and compatibility of the web page.</p> <h2 id="Example-of-usage"> Example of usage</h2> <h3 id="Common-HTML-verification-errors"> Common HTML verification errors</h3> <p> The most common HTML verification errors I encountered in actual development include:</p> <ul><li> <strong>Unclosed tags</strong> : For example, an unclosed <code><div> tag will cause an exception to display subsequent elements.<pre class='brush:php;toolbar:false;'>  <div> <p>This is a paragraph</p> <div>  <div> <p>This is a paragraph</p> </div></pre><ul><li> <strong>Incorrect properties</strong> : For example, <code>src</code> attribute value of the <code><img src="/static/imghw/default1.png" data-src="image.jpg" class="lazy" alt="What are some common HTML validation errors?" ></code> tag is not surrounded by quotes.</li></ul><pre class='brush:php;toolbar:false;'>  <img src="/static/imghw/default1.png" data-src="image.jpg" class="lazy" src=image.jpg alt="image description">  <img src="/static/imghw/default1.png" data-src="image.jpg" class="lazy" alt="picture description"></pre><ul><li> <strong>DOCTYPE declaration error</strong> : DOCTYPE declaration is the first line of the HTML document and is used to tell the browser which HTML version to use. If the declaration is wrong, it may cause the browser to render the page in Quirks Mode.</li></ul><pre class='brush:php;toolbar:false;'>  <html> <head> <title>Error DOCTYPE</title> </head> <body> <h1>Welcome</h1> </body> </html>  <!DOCTYPE html> <html> <head> <title>Correct DOCTYPE</title> </head> <body> <h1>Welcome</h1> </body> </html></pre><h3 id="Advanced-Usage"> Advanced Usage</h3><p> Some uncommon validation errors may be encountered when dealing with complex HTML structures. For example, nested form elements ( <code><form></code> ) can cause verification to fail because the HTML standard does not allow form nesting.</p><pre class='brush:php;toolbar:false;'>  <form> <form> <input type="text" name="username"> </form> </form>  <form> <input type="text" name="username"> </form></pre><h3 id="Common-Errors-and-Debugging-Tips"> Common Errors and Debugging Tips</h3><ul><li> <strong>Unknown elements</strong> : Sometimes introducing custom elements or not introducing external libraries correctly can lead to validation errors. The solution is to make sure all elements are standard HTML tags, or to properly introduce external resources.</li></ul><pre class='brush:php;toolbar:false;'>  <custom-element>This is a custom element</custom-element>  <div data-custom="true">This is a custom element</div></pre><ul><li> <strong>Character encoding error</strong> : If the character encoding declaration of the HTML document does not match the actual content, the verification tool will report an error. Make sure that the character encoding declaration in the <code><meta></code> tag is consistent with the encoding saved by the document.</li></ul><pre class='brush:php;toolbar:false;'>  <meta charset="UTF-8">   <meta charset="GBK"> </pre><h2 id="Performance-optimization-and-best-practices"> Performance optimization and best practices</h2> <p> In actual projects, optimizing the HTML verification process can improve development efficiency and web page quality. Some of my best practices include:</p> <ul> <li><p> <strong>Using automation tools</strong> : such as HTMLHint or ESLint, you can check HTML code in real time during development to avoid verification errors.</p></li> <li><p> <strong>Regular verification</strong> : Regular HTML verification during project development to promptly discover and fix problems, rather than waiting until the end of the project.</p></li> <li><p> <strong>Code specification</strong> : Follow unified code specifications to ensure that the code style of team members is consistent and reduce the occurrence of verification errors.</p></li> <li><p> <strong>Test environment</strong> : Test web pages on different browsers and devices to ensure compatibility and consistency of verification results.</p></li> </ul> <p> Through these practices, I have successfully avoided common HTML verification errors in multiple projects, improving the quality and user experience of the web pages.</p> <p> During the HTML verification process, developers need to pay attention to the following points:</p> <ul> <li><p> <strong>Selection of verification tools</strong> : Different verification tools may have different feedback on the same error, and it is very important to choose a tool that suits your development environment.</p></li> <li><p> <strong>Error priority</strong> : Not all verification errors need to be fixed immediately. Repair priority should be reasonably arranged according to the actual situation of the project.</p></li> <li><p> <strong>Automation and manual combination</strong> : While automation tools can help us spot most errors, some complex verification errors may require manual inspection and repair.</p></li> </ul> <p> Through these experiences and suggestions, I hope it can help you better understand and deal with common errors in HTML verification and improve your front-end development skills.</p> </div></code> </li></ul> </div><p>The above is the detailed content of What are some common HTML validation errors?. For more information, please follow other related articles on the PHP Chinese website!</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. 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These steps can significantly improve page loading performance without sacrificing functionality.</p> </div> <div id="377j5v51b" class="phphistorical_Version2_mids"> <a href="http://www.miracleart.cn/faq/1796824133.html" title="How do I use the element to represent the footer of a document or section?" 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/001/253/068/175078424215034.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="How do I use the element to represent the footer of a document or section?" /> </a> <a href="http://www.miracleart.cn/faq/1796824133.html" title="How do I use the element to represent the footer of a document or section?" class="phphistorical_Version2_mids_title">How do I use the element to represent the footer of a document or section?</a> <span id="377j5v51b" class="Articlelist_txts_time">Jun 25, 2025 am 12:57 AM</span> <p class="Articlelist_txts_p">It is a semantic tag used in HTML5 to define the bottom of the page or content block, usually including copyright information, contact information or navigation links; it can be placed at the bottom of the page or nested in, etc. tags as the end of the block; when using it, you should pay attention to avoid repeated abuse and irrelevant content.</p> </div> <div id="377j5v51b" class="phphistorical_Version2_mids"> <a href="http://www.miracleart.cn/faq/1796823674.html" title="How has HTML evolved over time, and what are the key milestones in its history?" 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/001/253/068/175069767173496.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="How has HTML evolved over time, and what are the key milestones in its history?" /> </a> <a href="http://www.miracleart.cn/faq/1796823674.html" title="How has HTML evolved over time, and what are the key milestones in its history?" class="phphistorical_Version2_mids_title">How has HTML evolved over time, and what are the key milestones in its history?</a> <span id="377j5v51b" class="Articlelist_txts_time">Jun 24, 2025 am 12:54 AM</span> <p class="Articlelist_txts_p">HTMLhasevolvedsignificantlysinceitscreationtomeetthegrowingdemandsofwebdevelopersandusers.Initiallyasimplemarkuplanguageforsharingdocuments,ithasundergonemajorupdates,includingHTML2.0,whichintroducedforms;HTML3.x,whichaddedvisualenhancementsandlayout</p> </div> <div id="377j5v51b" class="phphistorical_Version2_mids"> <a href="http://www.miracleart.cn/faq/1796822313.html" title="How do I embed video 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/001/253/068/175038535348364.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="How do I embed video in HTML using the element?" /> </a> <a href="http://www.miracleart.cn/faq/1796822313.html" title="How do I embed video in HTML using the element?" class="phphistorical_Version2_mids_title">How do I embed video in HTML using the element?</a> <span id="377j5v51b" class="Articlelist_txts_time">Jun 20, 2025 am 10:09 AM</span> <p class="Articlelist_txts_p">To embed videos in HTML, use tags and specify the video source and attributes. 1. Use src attributes or elements to define the video path and format; 2. Add basic attributes such as controls, width, height; 3. To be compatible with different browsers, you can list MP4, WebM, Ogg and other formats; 4. Use controls, autoplay, muted, loop, preload and other attributes to control the playback behavior; 5. Use CSS to realize responsive layout to ensure that it is adapted to different screens. Correct combination of structure and attributes can ensure good display and functional support of the video.</p> </div> </div> <a href="http://www.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://www.miracleart.cn/about/us.html">About us</a> <a href="http://www.miracleart.cn/about/disclaimer.html">Disclaimer</a> <a href="http://www.miracleart.cn/update/article_0_1.html">Sitemap</a> </div> <div id="377j5v51b" class="footerbottom"> <p> ? php.cn All rights reserved </p> </div> </div> </footer> <input type="hidden" id="verifycode" value="/captcha.html"> <link rel='stylesheet' id='_main-css' 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