前端新人学习笔记-html/css/js基础知识点(三)_html/css_WEB-ITnose
这断时间家里有点事,上班也有点任务,所以几天没看视频没来更新了。今天来更新一下了。
一:默认样式重置
但凡是浏览默认的样式,都不要使用。
body,p,h1,h2,h3,h4,h5,h6,dl,dd{margin:0; font-size:12px;/* font-family:XX; */}
ol,ul{list-style:none;padding:0;margin:0;}
a{text-decoration:none;}
img{border:none;}
二:块元素和内嵌元素
块元素的特征:
1.默认独占一行;
2.没有宽度时,默认撑满一排;
3.支持所有css命令;
内联元素的特征:
1.同类的标签可以在同排显示;
2.不支持宽高;
3.内容撑开宽度;
4.不支持上下的margin和padding;
5.代码换行被解析;
三:块元素和内嵌元素的转换
display:block 使内联元素具备块属性标签的特性;
display:inline 使块元素具备内嵌元素的特性。
display:inline-block
特性:1.块在一行显示;
2.行内属性标签支持宽高;
3.没有宽度的时候内容撑开;
问题:1.代码换行被解析;
2.ie6,7不支持块属性标签的inline-block;
四:浮动
1.块在一排显示;
2.内联元素也支持宽高了;
3.默认内容撑开宽度;
4.脱离文档流;
5.提升层级半层
这个时候div标签就和里面的内容位于同一层级了。
这个时候会出现这样的现象,这就和提升了半个层级有关。

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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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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.

The future of HTML is full of infinite possibilities. 1) New features and standards will include more semantic tags and the popularity of WebComponents. 2) The web design trend will continue to develop towards responsive and accessible design. 3) Performance optimization will improve the user experience through responsive image loading and lazy loading technologies.

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.

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