1、基本标签属性
1 <html> 2 <!--属性和属性值对大小写不敏感。 3 不过，万维网联盟在其 HTML 4 推荐标准中推荐小写的属性/属性值。 4 而新版本的 (X)HTML 要求使用小写属性。 5 --> 6 7 <body> 8 9 <!-- hello this is a comment-->10 11 <h1 id="This-is-heading">This is heading 1</h1>12 <h2 id="This-is-heading">This is heading 2</h2>13 <h3 id="This-is-heading">This is heading 3</h3>14 <h4 id="This-is-heading">This is heading 4</h4>15 <h5 id="This-is-heading">This is heading 5</h5>16 <h6 id="This-is-heading">This is heading 6</h6>17 18 <hr><!--绘制水平线-->19 20 <a href="http://www.baidu.com"> link_baidu </a>21 22 <br>23 <body bgcolor="#e6e6e6">24 25 26 <p> this is paragraph 1 </p>27 <p> this is paragraph 2 </p>28 <p> this is paragraph 3 </p>29 30 <img src="/static/imghwm/default1.png" data-src="/i/eg_w3school.gif" class="lazy"/ alt="1、HTML基础学习 第一天_html/css_WEB-ITnose" >31 <img src="/static/imghwm/default1.png" data-src="/i/eg_w3school.gif" class="lazy" style="max-width:90%" style="max-width:90%" / alt="1、HTML基础学习 第一天_html/css_WEB-ITnose" >32 <br/>33 <br/>34 <br/>35 36 37 normal38 <br/>39 <b> bold </b>40 <br/>41 <strong> strong </strong>42 <br/>43 <big> big font </big>44 <br/>45 <small> small font </small>46 <br/>47 <i> italic font </i>48 <br/>49 what's the <sub> fuck </sub>50 <br/>51 what's the <sup> fuck </sup>52 <br/>53 <i> what's the <sup> fuck </sup> </i>54 55 <p>pre 标签很适合显示计算机代码：</p>56 57 <pre class="brush:php;toolbar:false">58 for i = 1 to 1059 print i60 next i6162 63
What is the purpose of the <datalist> element?Mar 21, 2025 pm 12:33 PMThe article discusses the HTML <datalist> element, which enhances forms by providing autocomplete suggestions, improving user experience and reducing errors.Character count: 159
How do I use HTML5 form validation attributes to validate user input?Mar 17, 2025 pm 12:27 PMThe article discusses using HTML5 form validation attributes like required, pattern, min, max, and length limits to validate user input directly in the browser.
What is the purpose of the <iframe> tag? What are the security considerations when using it?Mar 20, 2025 pm 06:05 PMThe article discusses the <iframe> tag's purpose in embedding external content into webpages, its common uses, security risks, and alternatives like object tags and APIs.
What is the purpose of the <progress> element?Mar 21, 2025 pm 12:34 PMThe article discusses the HTML <progress> element, its purpose, styling, and differences from the <meter> element. The main focus is on using <progress> for task completion and <meter> for stati
What is the purpose of the <meter> element?Mar 21, 2025 pm 12:35 PMThe article discusses the HTML <meter> element, used for displaying scalar or fractional values within a range, and its common applications in web development. It differentiates <meter> from <progress> and ex
What are the best practices for cross-browser compatibility in HTML5?Mar 17, 2025 pm 12:20 PMArticle discusses best practices for ensuring HTML5 cross-browser compatibility, focusing on feature detection, progressive enhancement, and testing methods.
What is the viewport meta tag? Why is it important for responsive design?Mar 20, 2025 pm 05:56 PMThe article discusses the viewport meta tag, essential for responsive web design on mobile devices. It explains how proper use ensures optimal content scaling and user interaction, while misuse can lead to design and accessibility issues.
How do I use the HTML5 <time> element to represent dates and times semantically?Mar 12, 2025 pm 04:05 PMThis article explains the HTML5 <time> element for semantic date/time representation. It emphasizes the importance of the datetime attribute for machine readability (ISO 8601 format) alongside human-readable text, boosting accessibilit
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