单元3-评估2
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在本单元的学习中,我们将深入探讨“HTML”这一核心网页设计语言,特别是在“单元3-评估2”的背景下。HTML(HyperText Markup Language)是构建网页的基础,它定义了网页的结构和内容。在这个评估中,你可能会面临各种与HTML相关的挑战,旨在检验你对HTML语法、元素和属性的理解。 我们需要理解HTML的基本结构。一个基本的HTML文档由doctype声明开始,用来告诉浏览器文档的类型。接着是HTML标签,它包裹整个文档。HTML标签通常包括<head>和<body>两部分,前者用于存放元数据,如标题、样式表链接等,后者则包含实际的网页内容。 在<body>部分,常见的HTML元素有标题标签<h1>至<h6>,段落<p>,以及用于创建链接<a>和图像<img>的元素。例如,<a href="http://example.com">这是一个链接</a>会创建一个指向example.com的超链接,<img src="image.jpg" alt="图片描述">则会插入一幅图像,并提供替代文本。 HTML还支持列表,分为无序列表<ul>和有序列表<ol>,以及它们的子元素<li>来创建列表项。表格由<table>、<tr>(行)、<td>(数据单元格)和<th>(表头)组成,用于展示结构化数据。 此外,HTML5引入了许多新的元素,比如<header>、<footer>、<nav>、<article>和<section>,这些元素帮助我们更好地组织内容,提高语义化。例如,<header>通常用于页面或章节的顶部,<footer>则用于底部,<nav>标记导航链接,<article>代表独立的内容块,而<section>则用于分隔相关的内容。 在评估中,你可能需要编写或修改HTML代码,确保其符合W3C标准,并能正确渲染。这可能涉及到对CSS(Cascading Style Sheets)的初步了解,因为HTML负责内容,CSS则负责表现。通过class或id属性,你可以将样式应用到HTML元素上,实现布局和视觉效果。 例如,`.myClass {color: red;}`会为具有该类的所有元素设置红色文本,`#myID {background-color: blue;}`则会给指定ID的元素添加蓝色背景。了解如何使用盒模型(包括width, padding, border和margin)调整元素尺寸和位置也非常重要。 要关注HTML5的离线存储特性,如localStorage和sessionStorage,它们允许网页在用户关闭浏览器后仍能保留某些数据。这对于构建响应式和离线可用的应用程序非常有用。 “单元3-评估2”旨在通过一系列问题和任务,全面考察你对HTML基本语法、元素、属性以及与之相关的CSS和Web存储概念的理解和应用能力。通过这个过程,你将深化对网页开发基础的认识,为更高级的Web技术学习打下坚实基础。
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