在web页面中敲定一个高度,以高度得到一条首屏线,在首屏线上方的内容是需要第一之间展示给用户的,它能不能及时的展示是能否留住用户的一个非常重要的因素。研究认为,用户最满意的网页打开速度在2s以内。
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首屏时间
在web页面中敲定一个高度,以高度得到一条首屏线,在首屏线上方的内容是需要第一之间展示给用户的,它能不能及时的展示是能否留住用户的一个非常重要的因素。研究认为,用户最满意的网页打开速度在2s以内。
- 首屏时间:指用户在没有滚动页面时,看到的内容渲染完成以及可以交互的时间。
- 加载时间:整个页面滚动到底部,可以渲染并且交互的时间。
在用户访问一个站点时,浏览器会发送一个请求,请求该html文档,当浏览器接收到文档后,就会开始解析并渲染到窗口上。
在这个过程中,有两个非常重要的时间点:
- Time Of First Byte(首字节时间)
- Start Render Time(开始渲染时间)
以上两个时间点,将首屏时间分为了如下图三短时间:
Time Of First Byte
首字节时间越长,浏览器就越晚解析文档,首屏时间就越长。
在 HTML5 performance API 中提供了这个时间点。
如果首字节时间越长,那么瓶颈应该是存在于网络、后端程序等方面。
Start Render Time
Start Render Time是指用户屏幕刚开始显示某些内容的时候。
浏览器最开始是一片空白的,在绘制时就会产生变化,有可能是文字、背景、logo等。
非可视化的DOM如head标签是不会展示在浏览器窗口中的,这意味着在浏览器开始渲染之前,至少需要解析完head标签中的内容。
在一般情况下,只要文档中的css文件准备就绪就可以开始绘制,而我们的css文件都是写在head标签中的。因此,我们可以认为,只要是开始渲染body标签或者解析完head标签的时刻就是 Start Render Time。
根据这一特性,我们可以在body标签开始处或者head标签结束处埋下脚本用来获取 Start Render Time。
减少首屏使用的方法
- 首屏css内嵌
- css放 head内,js放

The roles of HTML, CSS and JavaScript in web development are: HTML is responsible for content structure, CSS is responsible for style, and JavaScript is responsible for dynamic behavior. 1. HTML defines the web page structure and content through tags to ensure semantics. 2. CSS controls the web page style through selectors and attributes to make it beautiful and easy to read. 3. JavaScript controls web page behavior through scripts to achieve dynamic and interactive functions.

HTMLisnotaprogramminglanguage;itisamarkuplanguage.1)HTMLstructuresandformatswebcontentusingtags.2)ItworkswithCSSforstylingandJavaScriptforinteractivity,enhancingwebdevelopment.

HTML is the cornerstone of building web page structure. 1. HTML defines the content structure and semantics, and uses, etc. tags. 2. Provide semantic markers, such as, etc., to improve SEO effect. 3. To realize user interaction through tags, pay attention to form verification. 4. Use advanced elements such as, combined with JavaScript to achieve dynamic effects. 5. Common errors include unclosed labels and unquoted attribute values, and verification tools are required. 6. Optimization strategies include reducing HTTP requests, compressing HTML, using semantic tags, etc.

HTML is a language used to build web pages, defining web page structure and content through tags and attributes. 1) HTML organizes document structure through tags, such as,. 2) The browser parses HTML to build the DOM and renders the web page. 3) New features of HTML5, such as, enhance multimedia functions. 4) Common errors include unclosed labels and unquoted attribute values. 5) Optimization suggestions include using semantic tags and reducing file size.

WebdevelopmentreliesonHTML,CSS,andJavaScript:1)HTMLstructurescontent,2)CSSstylesit,and3)JavaScriptaddsinteractivity,formingthebasisofmodernwebexperiences.

The role of HTML is to define the structure and content of a web page through tags and attributes. 1. HTML organizes content through tags such as , making it easy to read and understand. 2. Use semantic tags such as, etc. to enhance accessibility and SEO. 3. Optimizing HTML code can improve web page loading speed and user experience.

HTMLisaspecifictypeofcodefocusedonstructuringwebcontent,while"code"broadlyincludeslanguageslikeJavaScriptandPythonforfunctionality.1)HTMLdefineswebpagestructureusingtags.2)"Code"encompassesawiderrangeoflanguagesforlogicandinteract

HTML, CSS and JavaScript are the three pillars of web development. 1. HTML defines the web page structure and uses tags such as, etc. 2. CSS controls the web page style, using selectors and attributes such as color, font-size, etc. 3. JavaScript realizes dynamic effects and interaction, through event monitoring and DOM operations.


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