Expandable "Read More" Section

展开 / 收起内容（无 JS 版）

The Future of SEO Content / SEO 内容的未来

This first paragraph is always visible to the user. It serves as the "hook." 第一段内容始终对用户可见。它充当“引子”。

This text is fully indexable by Baidu and Google because it exists in the HTML source code. By using the "Checkbox Hack," we toggle the height of this container without JavaScript.

这段文字完全可以被百度和谷歌索引，因为它存在于 HTML 源代码中。通过使用“复选框技巧”，我们可以在无需 JavaScript 的情况下切换容器的高度。

Web designers often use JS to 'inject' this text, which is a major SEO mistake. If the script fails, the user never sees this information, and weaker crawlers ignore it. 网页设计师经常使用 JS 来“注入”这些文字，这是一个重大的 SEO 错误。如果脚本失效，用户永远看不到这些信息，弱小的爬虫也会忽略它。

SEO Insight / SEO 优化见解

Content Priority & Indexing

Many sites use JavaScript to asynchronously load "Read More" content. While this saves initial page weight, it creates a risk where search engines never see the secondary text. This CSS-first pattern includes 100% of the text in the initial HTML. Since it is hidden via max-height rather than being removed from the DOM, it remains fully searchable and indexed.

许多网站使用 JavaScript 异步加载“阅读更多”内容。虽然这节省了初始页面大小，但存在搜索引擎永远看不到次要文本的风险。这种CSS 优先模式在初始 HTML 中包含了 100% 的文本。由于它是通过 max-height 隐藏而不是从 DOM 中移除，因此它保持完全可搜索和可索引。

Avoiding "Hidden Content" Penalties

Search engines sometimes devalue content hidden behind display: none. By using height and opacity transitions, we maintain a visual "collapsed" state while signaling to the browser that the content is a relevant, active part of the page layout. This technique avoids the SEO pitfalls associated with "hidden-by-default" text.

搜索引擎有时会降低隐藏在 display: none 之后的内容的权重。通过使用高度和透明度过渡，我们维持了视觉上的“折叠”状态，同时向浏览器发出信号，表明该内容是页面布局中相关的、活跃的部分。这种技术避免了与“默认隐藏”文本相关的 SEO 陷阱。