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The parsing and rendering process of HTML5 involves the browser's parsing engine and rendering engine. The parsing engine converts HTML code into a DOM tree, while the rendering engine is responsible for rendering the DOM tree into a user-visible page. Using semantic tags can help browsers build DOM trees faster, thereby increasing page loading speed.<\/p>

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									<a href="#introduction" title=" introduction" > introduction</a>
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									<a href="#Review-of-basic-knowledge" title=" Review of basic knowledge" > Review of basic knowledge</a>
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						<span>H5 Code: Writing Clean and Efficient HTML5</span>
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							<h1 class="Articlelist_txts_title">H5 Code: Writing Clean and Efficient HTML5</h1>
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							<span id="wjcelcm34c"    class="Articlelist_txts_time">Apr 20, 2025 am	 12:06 AM</span>
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																			<span id="wjcelcm34c"    class="Articlelist_txts_infoss on">html5</span>
																			<span id="wjcelcm34c"    class="Articlelist_txts_infoss ">web development</span>
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					<p>How to write clean and efficient HTML5 code? The answer is to avoid common mistakes by semanticizing tags, structured code, performance optimization and avoiding common mistakes. 1. Use semantic tags such as <header>, <footer>, etc. to improve code readability and SEO effect. 2. Keep the code structured and readable, using appropriate indentation and comments. 3. Optimize performance by reducing unnecessary tags, using CDN and compressing code. 4. Avoid common mistakes, such as the tag not closed, and ensure the validity of the code.</footer></header></p>
<h2 id="introduction"> introduction</h2>
<p> You ask me how to write clean and efficient HTML5 code? This is not just a technical issue, but also an art and philosophy. HTML5 is the foundation of modern web development. Writing clean and efficient code can not only improve the user experience, but also make it easier for developers and maintainers. Today we will talk about how to implement this in HTML5. After reading this article, you will master basic to advanced HTML5 writing skills, learn how to avoid common mistakes, and learn some performance optimization tips.</p>
<h2 id="Review-of-basic-knowledge"> Review of basic knowledge</h2>
<p> HTML5, as the latest version of HTML, has introduced many new features and improvements, such as semantic tags, new form controls, multimedia support, etc. Understanding these new features is the basis for writing efficient HTML5 code. Semantic tags such as <code><header></header></code> , <code><footer></footer></code> , <code><nav></nav></code> , <code><article></article></code> etc. not only make the code more readable, but also allow search engines to better understand page structure.</p>
<p> Keeping the code structured and readable is key when writing HTML5. Using appropriate indentation and comments can greatly improve the maintainability of your code. At the same time, understanding the browser's parsing mechanism and rendering process can also help write more efficient code.</p>
<h2 id="Core-concept-or-function-analysis"> Core concept or function analysis</h2>
<h3 id="Definition-and-function-of-semantic-labels"> Definition and function of semantic labels</h3>
<p> Semantic tags are one of the cores of HTML5, and they give web page structure a clearer meaning. For example, <code><header></header></code> represents the head of the page, and <code><footer></footer></code> represents the bottom of the page. These tags not only make the code more readable, but also allow search engines to better understand page content, thereby improving SEO results.</p><pre class='brush:php;toolbar:false;'> <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Semantic HTML5 Example</title>
</head>
<body>
    <header>
        <h1>Welcome to My Website</h1>
    </header>
    <nav>
        <ul>
            <li><a href="#home">Home</a></li>
            <li><a href="#about">About</a></li>
        </ul>
    </nav>
    <main>
        <article>
            <h2>My First Article</h2>
            <p>This is the content of my first article.</p>
        </article>
    </main>
    <footer>
        <p>&copy; 2023 My Website</p>
    </footer>
</body>
</html></pre><h3 id="How-it-works"> How it works</h3><p> The parsing and rendering process of HTML5 involves the browser's parsing engine and rendering engine. The parsing engine converts HTML code into a DOM tree, while the rendering engine is responsible for rendering the DOM tree into a user-visible page. Using semantic tags can help browsers build DOM trees faster, thereby increasing page loading speed.</p><h2 id="Example-of-usage"> Example of usage</h2><h3 id="Basic-usage"> Basic usage</h3><p> In daily development, the common HTML5 structure is as follows:</p><pre class='brush:php;toolbar:false;'> <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>My Website</title>
</head>
<body>
    <header>
        <h1>Header</h1>
    </header>
    <main>
        <p>Main content goes here.</p>
    </main>
    <footer>
        <p>Footer</p>
    </footer>
</body>
</html></pre><p> This code shows the basic structure of HTML5, using <code><header></code> , <code><main></code> , and <code><footer></code> tags to define different parts of the page.</p><h3 id="Advanced-Usage"> Advanced Usage</h3><p> In more complex scenarios, we can use the new features of HTML5 to achieve richer functions. For example, use the <code><canvas></code> tag to draw graphics, or use <code><video></code> and <code><audio></code> tags to embed multimedia content.</p><pre class='brush:php;toolbar:false;'> <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Advanced HTML5 Example</title>
</head>
<body>
    <canvas id="myCanvas" width="500" height="300"></canvas>
    <script>
        var canvas = document.getElementById(&#39;myCanvas&#39;);
        var ctx = canvas.getContext(&#39;2d&#39;);
        ctx.fillStyle = &#39;red&#39;;
        ctx.fillRect(10, 10, 50, 50);
    </script>
    <video width="320" height="240" controls>
        <source src="movie.mp4" type="video/mp4">
        Your browser does not support the video tag.
    </video>
</body>
</html></pre><p> This code shows how to draw a simple rectangle using <code><canvas></canvas></code> and how to embed a video.</p>
<h3 id="Common-Errors-and-Debugging-Tips"> Common Errors and Debugging Tips</h3>
<p> Common errors when writing HTML5 code include unclosed tags, unquoted attribute values, incorrect tags, etc. Here are some debugging tips:</p>
<ul>
<li> Use browser developer tools to view and debug HTML structures.</li>
<li> Make sure all labels are closed correctly and avoid unclosed labels.</li>
<li> Use a verification tool such as the W3C Verifier to check the validity of the code.</li>
</ul>
<h2 id="Performance-optimization-and-best-practices"> Performance optimization and best practices</h2>
<p> In practical applications, optimizing HTML5 code can significantly improve the loading speed and user experience of the page. Here are some optimization tips:</p>
<ul>
<li> Reduce unnecessary tags and attributes and keep the code concise.</li>
<li> Use CDN to speed up the loading of static resources.</li>
<li> Compress HTML code to reduce file size.</li>
</ul>
<p> When comparing performance differences between different methods, you can use tools such as Lighthouse or WebPageTest to test. For example, compressing HTML code can significantly reduce page loading time.</p>
<p> It is important to keep the code readable and maintained in terms of programming habits and best practices. Using meaningful class names and IDs and adding appropriate comments can make the code easier to understand and maintain.</p>
<p> In short, writing clean and efficient HTML5 code requires a deep understanding of its core concepts and continuous optimization and improvement in practice. Hopefully this article provides you with some useful insights and tips to help you achieve better results in HTML5 development.</p><p>The above is the detailed content of H5 Code: Writing Clean and Efficient HTML5. For more information, please follow other related articles on the PHP Chinese website!</p>


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									<img onerror="this.onerror=''; this.src='/static/imghw/default1.png'"
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											<a href="http://ipnx.cn/ai/undress-ai-tool" title="Undress AI Tool" class="phpmain_tab2_mids_top_img">
												<img onerror="this.onerror=''; this.src='/static/imghw/default1.png'"
													onerror="this.onerror=''; this.src='/static/imghw/default1.png'"
													class="lazy"  data-src="https://img.php.cn/upload/ai_manual/001/246/273/173410641626608.jpg?x-oss-process=image/resize,m_fill,h_50,w_50" src="/static/imghw/default1.png" alt="Undress AI Tool" />
											</a>
											<div   id="wjcelcm34c"   class="phpmain_tab2_mids_info">
												<a href="http://ipnx.cn/ai/undress-ai-tool" title="Undress AI Tool" class="phpmain_tab2_mids_title">
													<h3>Undress AI Tool</h3>
												</a>
												<p>Undress images for free</p>
											</div>
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											<a href="http://ipnx.cn/ai/undresserai-undress" title="Undresser.AI Undress" class="phpmain_tab2_mids_top_img">
												<img onerror="this.onerror=''; this.src='/static/imghw/default1.png'"
													onerror="this.onerror=''; this.src='/static/imghw/default1.png'"
													class="lazy"  data-src="https://img.php.cn/upload/ai_manual/001/246/273/173411540686492.jpg?x-oss-process=image/resize,m_fill,h_50,w_50" src="/static/imghw/default1.png" alt="Undresser.AI Undress" />
											</a>
											<div   id="wjcelcm34c"   class="phpmain_tab2_mids_info">
												<a href="http://ipnx.cn/ai/undresserai-undress" title="Undresser.AI Undress" class="phpmain_tab2_mids_title">
													<h3>Undresser.AI Undress</h3>
												</a>
												<p>AI-powered app for creating realistic nude photos</p>
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											<a href="http://ipnx.cn/ai/ai-clothes-remover" title="AI Clothes Remover" class="phpmain_tab2_mids_top_img">
												<img onerror="this.onerror=''; this.src='/static/imghw/default1.png'"
													onerror="this.onerror=''; this.src='/static/imghw/default1.png'"
													class="lazy"  data-src="https://img.php.cn/upload/ai_manual/001/246/273/173411552797167.jpg?x-oss-process=image/resize,m_fill,h_50,w_50" src="/static/imghw/default1.png" alt="AI Clothes Remover" />
											</a>
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												<a href="http://ipnx.cn/ai/ai-clothes-remover" title="AI Clothes Remover" class="phpmain_tab2_mids_title">
													<h3>AI Clothes Remover</h3>
												</a>
												<p>Online AI tool for removing clothes from photos.</p>
											</div>
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											<a href="http://ipnx.cn/ai/clothoffio" title="Clothoff.io" class="phpmain_tab2_mids_top_img">
												<img onerror="this.onerror=''; this.src='/static/imghw/default1.png'"
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													class="lazy"  data-src="https://img.php.cn/upload/ai_manual/001/246/273/173411529149311.jpg?x-oss-process=image/resize,m_fill,h_50,w_50" src="/static/imghw/default1.png" alt="Clothoff.io" />
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												<a href="http://ipnx.cn/ai/clothoffio" title="Clothoff.io" class="phpmain_tab2_mids_title">
													<h3>Clothoff.io</h3>
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												<p>AI clothes remover</p>
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											<a href="http://ipnx.cn/ai/video-swap" title="Video Face Swap" class="phpmain_tab2_mids_top_img">
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													class="lazy"  data-src="https://img.php.cn/upload/ai_manual/001/246/273/173414504068133.jpg?x-oss-process=image/resize,m_fill,h_50,w_50" src="/static/imghw/default1.png" alt="Video Face Swap" />
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											<div   id="wjcelcm34c"   class="phpmain_tab2_mids_info">
												<a href="http://ipnx.cn/ai/video-swap" title="Video Face Swap" class="phpmain_tab2_mids_title">
													<h3>Video Face Swap</h3>
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												<p>Swap faces in any video effortlessly with our completely free AI face swap tool!</p>
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									<a href="http://ipnx.cn/faq/1796831905.html" title="Windows Security is blank or not showing options" class="phpgenera_Details_mainR4_bottom_title">Windows Security is blank or not showing options</a>
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											<a href="http://ipnx.cn/toolset/development-tools/92" title="Notepad++7.3.1" class="phpmain_tab2_mids_top_img">
												<img onerror="this.onerror=''; this.src='/static/imghw/default1.png'"
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												<a href="http://ipnx.cn/toolset/development-tools/92" title="Notepad++7.3.1" class="phpmain_tab2_mids_title">
													<h3>Notepad++7.3.1</h3>
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												<p>Easy-to-use and free code editor</p>
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											<a href="http://ipnx.cn/toolset/development-tools/93" title="SublimeText3 Chinese version" class="phpmain_tab2_mids_top_img">
												<img onerror="this.onerror=''; this.src='/static/imghw/default1.png'"
													onerror="this.onerror=''; this.src='/static/imghw/default1.png'"
													class="lazy"  data-src="https://img.php.cn/upload/manual/000/000/001/58ab97a3baad9677.jpg?x-oss-process=image/resize,m_fill,h_50,w_72" src="/static/imghw/default1.png" alt="SublimeText3 Chinese version" />
											</a>
											<div   id="wjcelcm34c"   class="phpmain_tab2_mids_info">
												<a href="http://ipnx.cn/toolset/development-tools/93" title="SublimeText3 Chinese version" class="phpmain_tab2_mids_title">
													<h3>SublimeText3 Chinese version</h3>
												</a>
												<p>Chinese version, very easy to use</p>
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																			<div   id="wjcelcm34c"   class="phpmain_tab2_mids_top">
											<a href="http://ipnx.cn/toolset/development-tools/121" title="Zend Studio 13.0.1" class="phpmain_tab2_mids_top_img">
												<img onerror="this.onerror=''; this.src='/static/imghw/default1.png'"
													onerror="this.onerror=''; this.src='/static/imghw/default1.png'"
													class="lazy"  data-src="https://img.php.cn/upload/manual/000/000/001/58ab97ecd1ab2670.jpg?x-oss-process=image/resize,m_fill,h_50,w_72" src="/static/imghw/default1.png" alt="Zend Studio 13.0.1" />
											</a>
											<div   id="wjcelcm34c"   class="phpmain_tab2_mids_info">
												<a href="http://ipnx.cn/toolset/development-tools/121" title="Zend Studio 13.0.1" class="phpmain_tab2_mids_title">
													<h3>Zend Studio 13.0.1</h3>
												</a>
												<p>Powerful PHP integrated development environment</p>
											</div>
										</div>
																			<div   id="wjcelcm34c"   class="phpmain_tab2_mids_top">
											<a href="http://ipnx.cn/toolset/development-tools/469" title="Dreamweaver CS6" class="phpmain_tab2_mids_top_img">
												<img onerror="this.onerror=''; this.src='/static/imghw/default1.png'"
													onerror="this.onerror=''; this.src='/static/imghw/default1.png'"
													class="lazy"  data-src="https://img.php.cn/upload/manual/000/000/001/58d0e0fc74683535.jpg?x-oss-process=image/resize,m_fill,h_50,w_72" src="/static/imghw/default1.png" alt="Dreamweaver CS6" />
											</a>
											<div   id="wjcelcm34c"   class="phpmain_tab2_mids_info">
												<a href="http://ipnx.cn/toolset/development-tools/469" title="Dreamweaver CS6" class="phpmain_tab2_mids_title">
													<h3>Dreamweaver CS6</h3>
												</a>
												<p>Visual web development tools</p>
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											<a href="http://ipnx.cn/toolset/development-tools/500" title="SublimeText3 Mac version" class="phpmain_tab2_mids_top_img">
												<img onerror="this.onerror=''; this.src='/static/imghw/default1.png'"
													onerror="this.onerror=''; this.src='/static/imghw/default1.png'"
													class="lazy"  data-src="https://img.php.cn/upload/manual/000/000/001/58d34035e2757995.png?x-oss-process=image/resize,m_fill,h_50,w_72" src="/static/imghw/default1.png" alt="SublimeText3 Mac version" />
											</a>
											<div   id="wjcelcm34c"   class="phpmain_tab2_mids_info">
												<a href="http://ipnx.cn/toolset/development-tools/500" title="SublimeText3 Mac version" class="phpmain_tab2_mids_title">
													<h3>SublimeText3 Mac version</h3>
												</a>
												<p>God-level code editing software (SublimeText3)</p>
											</div>
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					<div   id="wjcelcm34c"   class="phpgenera_Details_mainR4">
						<div   id="wjcelcm34c"   class="phpmain1_4R_readrank">
							<div   id="wjcelcm34c"   class="phpmain1_4R_readrank_top">
								<img onerror="this.onerror=''; this.src='/static/imghw/default1.png'"
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								<h2>Hot Topics</h2>
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										<div   id="wjcelcm34c"   class="phpgenera_Details_mainR4_bottoms_infos">
											<img src="/static/imghw/eyess.png" alt="" />
											<span>1597</span>
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											<span>29</span>
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									<a href="http://ipnx.cn/faq/php-tutorial" title="PHP Tutorial" class="phpgenera_Details_mainR4_bottom_title">PHP Tutorial</a>
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											<img src="/static/imghw/eyess.png" alt="" />
											<span>1488</span>
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											<span>72</span>
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									<img onerror="this.onerror=''; this.src='/static/imghw/default1.png'"
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								<a href="http://ipnx.cn/faq/1796829157.html" title="Handling reconnections and errors with HTML5 Server-Sent Events." class="phphistorical_Version2_mids_title">Handling reconnections and errors with HTML5 Server-Sent Events.</a>
								<span id="wjcelcm34c"    class="Articlelist_txts_time">Jul 03, 2025 am	 02:28 AM</span>
								<p class="Articlelist_txts_p">When using HTML5SSE, the methods to deal with reconnection and errors include: 1. Understand the default reconnection mechanism. EventSource retrys 3 seconds after the connection is interrupted by default. You can customize the interval through the retry field; 2. Listen to the error event to deal with connection failure or parsing errors, distinguish error types and execute corresponding logic, such as network problems relying on automatic reconnection, server errors manually delay reconnection, and authentication failure refresh token; 3. Actively control the reconnection logic, such as manually closing and rebuilding the connection, setting the maximum number of retry times, combining navigator.onLine to judge network status to optimize the retry strategy. These measures can improve application stability and user experience.</p>
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									<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/001/253/068/175226046128038.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="Integrating CSS and JavaScript effectively with HTML5 structure." />
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								<a href="http://ipnx.cn/faq/1796835653.html" title="Integrating CSS and JavaScript effectively with HTML5 structure." class="phphistorical_Version2_mids_title">Integrating CSS and JavaScript effectively with HTML5 structure.</a>
								<span id="wjcelcm34c"    class="Articlelist_txts_time">Jul 12, 2025 am	 03:01 AM</span>
								<p class="Articlelist_txts_p">HTML5, CSS and JavaScript should be efficiently combined with semantic tags, reasonable loading order and decoupling design. 1. Use HTML5 semantic tags, such as improving structural clarity and maintainability, which is conducive to SEO and barrier-free access; 2. CSS should be placed in, use external files and split by module to avoid inline styles and delayed loading problems; 3. JavaScript is recommended to be introduced in front, and use defer or async to load asynchronously to avoid blocking rendering; 4. Reduce strong dependence between the three, drive behavior through data-* attributes and class name control status, and improve collaboration efficiency through unified naming specifications. These methods can effectively optimize page performance and collaborate with teams.</p>
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								<a href="http://ipnx.cn/faq/1796828529.html" title="Receiving real-time data with HTML5 Server-Sent Events (SSE)." class="phphistorical_Version2_mids_title">Receiving real-time data with HTML5 Server-Sent Events (SSE).</a>
								<span id="wjcelcm34c"    class="Articlelist_txts_time">Jul 02, 2025 pm	 04:46 PM</span>
								<p class="Articlelist_txts_p">Server-SentEvents (SSE) is a lightweight solution provided by HTML5 to push real-time updates to the browser. It realizes one-way communication through long HTTP connections, which is suitable for stock market, notifications and other scenarios. Create EventSource instance and listen for messages when using: consteventSource=newEventSource('/stream'); eventSource.onmessage=function(event){console.log('Received message:',event.data);}; The server needs to set Content-Type to text/event</p>
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								<a href="http://ipnx.cn/faq/1796829178.html" title="Declaring the correct HTML5 doctype for modern pages." class="phphistorical_Version2_mids_title">Declaring the correct HTML5 doctype for modern pages.</a>
								<span id="wjcelcm34c"    class="Articlelist_txts_time">Jul 03, 2025 am	 02:35 AM</span>
								<p class="Articlelist_txts_p">Doctype is a statement that tells the browser which HTML standard to use to parse the page. Modern web pages only need to be written at the beginning of the HTML file. Its function is to ensure that the browser renders the page in standard mode rather than weird mode, and must be located on the first line, with no spaces or comments in front of it; there is only one correct way to write it, and it is not recommended to use old versions or other variants; other such as charset, viewport, etc. should be placed in part.</p>
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								<a href="http://ipnx.cn/faq/1796828942.html" title="Improving SEO with HTML5 semantic markup and Microdata." class="phphistorical_Version2_mids_title">Improving SEO with HTML5 semantic markup and Microdata.</a>
								<span id="wjcelcm34c"    class="Articlelist_txts_time">Jul 03, 2025 am	 01:16 AM</span>
								<p class="Articlelist_txts_p">Using HTML5 semantic tags and Microdata can improve SEO because it helps search engines better understand page structure and content meaning. 1. Use HTML5 semantic tags such as,,,, and to clarify the function of page blocks, which helps search engines establish a more accurate page model; 2. Add Microdata structured data to mark specific content, such as article author, release date, product price, etc., so that search engines can identify information types and use them for display of rich media summary; 3. Pay attention to the correct use of tags to avoid confusion, avoid duplicate tags, test the effectiveness of structured data, regularly update to adapt to changes in schema.org, and combine with other SEO means to optimize for long-term.</p>
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									<img onerror="this.onerror=''; this.src='/static/imghw/default1.png'"
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								<a href="http://ipnx.cn/faq/1796835678.html" title="Explaining the HTML5 `` vs `` elements." class="phphistorical_Version2_mids_title">Explaining the HTML5 `` vs `` elements.</a>
								<span id="wjcelcm34c"    class="Articlelist_txts_time">Jul 12, 2025 am	 03:09 AM</span>
								<p class="Articlelist_txts_p">It is a block-level element, suitable for layout; it is an inline element, suitable for wrapping text content. 1. Exclusively occupy a line, width, height and margins can be set, which are often used in structural layout; 2. No line breaks, the size is determined by the content, and is suitable for local text styles or dynamic operations; 3. When choosing, it should be judged based on whether the content needs independent space; 4. It cannot be nested and is not suitable for layout; 5. Priority is given to the use of semantic labels to improve structural clarity and accessibility.</p>
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								<a href="http://ipnx.cn/faq/1796828542.html" title="Getting the user's current location with the HTML5 Geolocation API." class="phphistorical_Version2_mids_title">Getting the user's current location with the HTML5 Geolocation API.</a>
								<span id="wjcelcm34c"    class="Articlelist_txts_time">Jul 02, 2025 pm	 05:03 PM</span>
								<p class="Articlelist_txts_p">When using HTML5Geolocation API to obtain user location, you must first obtain user authorization, and request and explain the purpose at the right time; the basic method is navigator.geolocation.getCurrentPosition(), which contains successful callbacks, wrong callbacks and configuration parameters; common reasons for failure include permission denied, browser not supported, network problems, etc., alternative solutions and clear prompts should be provided. The specific suggestions are as follows: 1. Request permissions when the user operation is triggered, such as clicking the button; 2. Use enableHighAccuracy, timeout, maximumAge and other parameters to optimize the positioning effect; 3. Error handling should distinguish between different errors</p>
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								<a href="http://ipnx.cn/faq/1796830486.html" title="What are some recommended Sublime Text packages for web development?" class="phphistorical_Version2_mids_img">
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								<span id="wjcelcm34c"    class="Articlelist_txts_time">Jul 05, 2025 am	 01:27 AM</span>
								<p class="Articlelist_txts_p">SublimeText's best package improves web development efficiency. 1. Emmet quickly generates HTML/CSS code, such as using the abbreviation div.container to automatically generate complete tags, and supports nested and duplicate elements; 2. SideBarEnhancements enhances file management, providing new templates, trash can move, right-click browser opening and other functions; 3. CSScomb automatically organizes the order of CSS attributes, improves readability and maintenance, and supports custom sorting rules; 4. GitGutter displays code change marks, which facilitates quick view of newly added, deleted or modified lines of code; 5. LSP and language plug-ins provide real-time code prompts such as intelligent completion, jump definition, error checking, etc.</p>
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