一、HTML文档结构与基础语法
标准的HTML文档由</code>），主体区域承载网页内容。</p><img src="//imgfile1.oss-cn-hangzhou.aliyuncs.com/keji/317.jpg" />
<h2 id="section-2">二、常用元素与页面布局设计</h2>
<p>基础内容组织需掌握以下标签：</p>
<ul>
<li><strong>文本格式化</strong>：<code><br />
<h1>-</p>
<h6></code>定义标题层级，<code></p>
<p></code>包裹段落文本</li><li><strong>多媒体嵌入</strong>：<code></code>插入图像，<code></code>创建超链接</li><li><strong>结构化布局</strong>：使用<code><br /><header></code>、<code><main></code>、<code></p>
<footer></code>划分页面区块</li>
</ul>
<h2 id="section-3">三、CSS集成与响应式设计规范</h2>
<p>通过<code></code>引入外部样式表，实现样式与结构的分离。响应式设计的核心要素包括：</p>
<p style="text-align: center"></p>
<ol>
<li>使用<code>viewport</code>元标签适配移动端显示</li>
<li>采用百分比布局与<code>max-width</code>属性控制元素尺寸</li>
<li>通过媒体查询（<code>@media</code>）适配不同屏幕分辨率</li>
</ol>
<h2 id="section-4">四、HTML5新特性与兼容性处理</h2>
<figure>
<table>
<caption>HTML5语义化标签说明</caption>
<tr>
<th>标签</th>
<th>描述</th>
</tr>
<tr>
<td><code></p>
<header></code></td>
<td>定义文档或区块的头部</td>
</tr>
<tr>
<td><code></p>
</code></td>
<td>表示独立内容区块</td>
</tr>
<tr>
<td><code><video></code></td>
<td>嵌入视频无需插件支持</td>
</tr>
</table>
</figure>
<p>建议使用MDN Web Docs查阅浏览器兼容性数据，并通过Polyfill技术实现旧版本浏览器支持。</p>
<h2 id="section-5">五、<span class="wpcom_tag_link">SEO优化</span>与网页可访问性指南</h2>
<p>提升搜索引擎可见性的关键措施：</p>
<ul>
<li>为所有图像添加<code>alt</code>属性描述</li>
<li>使用<code></code>设置页面摘要</li>
<li>通过<code>aria-*</code>属性增强屏幕阅读器支持</li>
</ul>
<p>掌握HTML基础语法与设计规范是构建专业网站的基石。通过语义化标签、<span class="wpcom_tag_link">响应式布局</span>与SEO优化技术的结合，可创建既符合现代Web标准又具备良好用户体验的网站。</p>
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# <a href="/tags/322.html" target="_blank" >见性</a>
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# <a href="/tags/4459.html" target="_blank" >新特性</a>
# <a href="/tags/1600.html" target="_blank" >全攻略</a>
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fvalue = first.options[findex].value;
sindex = second.selectedIndex;
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tindex = third.selectedIndex;
tvalue = third.options[tindex].value;
if (tvalue) {
input.value = fvalue+','+svalue+','+tvalue;
value = tvalue;
}else{
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