文件后缀名
sass有两种后缀名文件:一种后缀名为sass,不使用大括
号和分号;另一种就是我们这里使用的scss文件,这种和我们
平时写的css文件格式差不多,使用大括号和分号。而本教程中
所说的所有sass文件都指后缀名为scss的文件。在此也建议使
用后缀名为scss的文件,以避免sass后缀名的严格格式要求报错
导入
sass的导入(@import)规则和CSS的有所不同,编译时会将@import
的scss文件合并进来只生成一个CSS文件。但是如果你在sass
文件中导入css文件如@import 'reset.css',那效果跟普通
CSS导入样式文件一样,导入的css文件不会合并到编译后的文
件中,而是以@import方式存在。
所有的sass导入文件都可以忽略后缀名.scss。一般来说基础的
文件命名方法以_开头,如_mixin.scss。这种文件在导入的时
候可以不写下划线,可写成@import "mixin"。
注释
sass有两种注释方式,一种是标准的css注释方式/* */,另一
种则是//双斜杆形式的单行注释,不过这种单行注释不会被转译
出来。
双斜杆单行注释
单行注释跟JavaScript语言中的注释一样,使用又斜杠(//)
,但单行注释不会输入到CSS中。
变量
sass的变量必须是$开头,后面紧跟变量名,而变量值和变量名
之间就需要使用冒号(:)分隔开(就像CSS属性设置一样),如
果值后面加上!default则表示默认值。
混合(mixin)
sass中使用@mixin声明混合,可以传递参数,参数名以$符号
开始,多个参数以逗号分开,也可以给参数设置默认值。声明的
@mixin通过@include来调用。
多个参数mixin
调用时可直接传入值,如@include传入参数的个数小于@mixin
定义参数的个数,则按照顺序表示,后面不足的使用默认值,如
不足的没有默认值则报错。除此之外还可以选择性的传入参数,
使用参数名与值同时传入。

HTMLtagsareessentialforstructuringwebpages,enhancingaccessibility,SEO,andperformance.1)Theyareenclosedinanglebracketsandusedinpairstocreateahierarchicalstructure.2)SemantictagslikeandimproveuserexperienceandSEO.3)Creativetagslikeenabledynamicgraphics

Self-closingtagsinHTMLandXMLaretagsthatclosethemselveswithoutneedingaseparateclosingtag,simplifyingmarkupstructureandenhancingcodingefficiency.1)TheyareessentialinXMLforelementswithoutcontent,ensuringwell-formeddocuments.2)InHTML5,usageisflexiblebutr

To build a website with powerful functions and good user experience, HTML alone is not enough. The following technology is also required: JavaScript gives web page dynamic and interactiveness, and real-time changes are achieved by operating DOM. CSS is responsible for the style and layout of the web page to improve aesthetics and user experience. Modern frameworks and libraries such as React, Vue.js and Angular improve development efficiency and code organization structure.

Boolean attributes are special attributes in HTML that are activated without a value. 1. The Boolean attribute controls the behavior of the element by whether it exists or not, such as disabled disable the input box. 2.Their working principle is to change element behavior according to the existence of attributes when the browser parses. 3. The basic usage is to directly add attributes, and the advanced usage can be dynamically controlled through JavaScript. 4. Common mistakes are mistakenly thinking that values need to be set, and the correct writing method should be concise. 5. The best practice is to keep the code concise and use Boolean properties reasonably to optimize web page performance and user experience.

HTML code can be cleaner with online validators, integrated tools and automated processes. 1) Use W3CMarkupValidationService to verify HTML code online. 2) Install and configure HTMLHint extension in VisualStudioCode for real-time verification. 3) Use HTMLTidy to automatically verify and clean HTML files in the construction process.

HTML, CSS and JavaScript are the core technologies for building modern web pages: 1. HTML defines the web page structure, 2. CSS is responsible for the appearance of the web page, 3. JavaScript provides web page dynamics and interactivity, and they work together to create a website with a good user experience.

The function of HTML is to define the structure and content of a web page, and its purpose is to provide a standardized way to display information. 1) HTML organizes various parts of the web page through tags and attributes, such as titles and paragraphs. 2) It supports the separation of content and performance and improves maintenance efficiency. 3) HTML is extensible, allowing custom tags to enhance SEO.

The future trends of HTML are semantics and web components, the future trends of CSS are CSS-in-JS and CSSHoudini, and the future trends of JavaScript are WebAssembly and Serverless. 1. HTML semantics improve accessibility and SEO effects, and Web components improve development efficiency, but attention should be paid to browser compatibility. 2. CSS-in-JS enhances style management flexibility but may increase file size. CSSHoudini allows direct operation of CSS rendering. 3.WebAssembly optimizes browser application performance but has a steep learning curve, and Serverless simplifies development but requires optimization of cold start problems.


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