嘿,前端爱好者! ?无论您是准备第一次面试还是准备迎接下一个重大机会,掌握 HTML 都是必须的。以下是最常见 HTML 面试问题的精选列表以及实际示例。让我们深入了解吧! ?
语义标签清楚地描述了它们在网页中的用途。它们使您的代码更具可读性并改善 SEO。 ?
示例:
<!-- Semantic --> <header> <h1>Welcome to My Blog</h1> </header> <article> <h2>How to Code</h2> <p>Start by learning the basics...</p> </article> <!-- Non-semantic --> <div> <p><strong>Why it matters:</strong> Semantic tags improve accessibility and help search engines understand your content better.</p> <hr> <h3> 2. <strong>What is the difference between id and class attributes?</strong> </h3> <ul> <li> id: Unique identifier, used once per page.</li> <li> class: Can be reused multiple times for styling or grouping elements.</li> </ul> <p><strong>Example:</strong><br> </p> <pre class="brush:php;toolbar:false"><!-- Using id --> <div> <p><strong>Pro Tip:</strong> Use id for unique elements like headers or footers, and class for reusable components.</p> <hr> <h3> 3. <strong>What are void elements in HTML?</strong> </h3> <p>Void elements are self-closing and don’t have a closing tag.</p> <p><strong>Examples:</strong><br> </p> <pre class="brush:php;toolbar:false"><img src="image.jpg" alt="A beautiful view"> <input type="text" placeholder="Enter your name"> <hr>
有趣的事实:向 void 元素添加结束标签是无效的 HTML!
包含 JavaScript 的方式有三种:
1) 内联:
<button onclick="alert('Hello!')">Click Me</button>
2) 内部:
<script> console.log('Hello from internal script!'); </script>
3) 外部:
<script src="script.js"></script>
专业提示: 外部脚本是更好的关注点分离的首选。 ?️
alt 属性在图像未显示时或为屏幕阅读器提供替代文本。
示例:
<img src="logo.png" alt="Company Logo">
为什么重要:增强可访问性并提高 SEO 排名。
示例:
<!-- Inline --> <span>This is inline</span> <span>Another inline</span> <!-- Block --> <div>This is block</div> <div>Another block</div> <!-- Inline-block --> <div> <p><strong>Pro Tip:</strong> Use inline-block for layouts where you need elements side-by-side with specific dimensions.</p> <hr> <h3> 7. <strong>What are data attributes in HTML?</strong> </h3> <p>Custom attributes to store extra data without cluttering your DOM.</p> <p><strong>Example:</strong><br> </p> <pre class="brush:php;toolbar:false"><button data-user-id="123" onclick="handleClick(this)">Click Me</button> <script> function handleClick(button) { alert(`User ID: ${button.dataset.userId}`); } </script>
为什么它们很方便:非常适合将数据传递到 JavaScript,无需硬编码。
示例:
<button aria-label="Submit Form">Submit</button>
专业提示:使用屏幕阅读器测试您的网站在现实世界中的可访问性。 ?
示例:
<!-- Semantic --> <header> <h1>Welcome to My Blog</h1> </header> <article> <h2>How to Code</h2> <p>Start by learning the basics...</p> </article> <!-- Non-semantic --> <div> <p><strong>Why it matters:</strong> Semantic tags improve accessibility and help search engines understand your content better.</p> <hr> <h3> 2. <strong>What is the difference between id and class attributes?</strong> </h3> <ul> <li> id: Unique identifier, used once per page.</li> <li> class: Can be reused multiple times for styling or grouping elements.</li> </ul> <p><strong>Example:</strong><br> </p> <pre class="brush:php;toolbar:false"><!-- Using id --> <div> <p><strong>Pro Tip:</strong> Use id for unique elements like headers or footers, and class for reusable components.</p> <hr> <h3> 3. <strong>What are void elements in HTML?</strong> </h3> <p>Void elements are self-closing and don’t have a closing tag.</p> <p><strong>Examples:</strong><br> </p> <pre class="brush:php;toolbar:false"><img src="image.jpg" alt="A beautiful view"> <input type="text" placeholder="Enter your name"> <hr>
快速提示:不要混淆两者——一个用于资源,另一个用于导航!
声明定义了文档中使用的 HTML 版本。
示例:
<button onclick="alert('Hello!')">Click Me</button>
有趣的事实:即使缺少文档类型,现代浏览器也默认为 HTML5,但最好包含它。
让我们测试一下您的知识。在下面的评论中回答这些问题! ?
将你的答案写在下面,我们来讨论吧! ?
以上是前端开发人员最常见的 HTML 面试问题的详细内容。更多信息请关注PHP中文网其他相关文章!