一、CSS允许应用纯色作为背景,也允许使用背景图像创建相当复杂的效果
二、属性:
background-color 设置元素的背景颜色
body{ background-color: darkgray;}<p>测试一下背景是否可以继承</p>
background-color这个属性是不可以被继承的
p{ background-color: aqua;}
这时候可以看到p元素加上了一个背景颜色,但是这个时候背景颜色比较长,它已经超出了文字的范围,要想修改的话只能在css样式来进行修改,修改它整个p标签的宽度
p{ width: 150px; background-color: aqua;}
现在可以看到p标签宽度被修改后的效果,但是这个时候的背景颜色有点窄,那么可以通过一个padding属性给它增宽
p{ width: 150px; padding: 10px; background-color: aqua;}
background-image 把图片设置为背景
body{ background-image: url("1.jpg");}
也可以单独地给一个标签加上背景颜色
p{ background-image: url("1.jpg");}
background-position 设置背景图片的起始位置
body{ background-image: url("1.jpg"); background-repeat: no-repeat; background-position: right;}
这时候背景图片跑到了右边并且图片只剩下一半了
其实这个属性很少单独出现,我们看到的是一个right,其实它是出现了两个属性
right代表的是“right”和“center”
right代表的是图片所处的当前视图的位置
center是代表当前图片要显示的位置(即图片从中间开始显示)
这个时候可以对background-position属性值做一下修改
background-position: right top;
这时候代表背景图片在视图的右侧显示,从图片的顶部开始(可以看到全面显示的效果)
也可以在background-position内添加具体的数值
background-position: 0px 0px;
这时候代表从左上角(0,0)点开始
很多时候用数值来确定它的位置会方便一些
也可以用百分数来确定它的位置
background-attachment 背景图像是否固定或者随着页面的其余部分滚动
body{ background-image: url("1.jpg"); background-repeat: no-repeat; background-attachment: fixed;}
默认情况下背景图片随着页面滚动
这里把background-attachment属性设置为不随着页面滚动
background-repeat 设置背景图片是否及如何重复
这里在前面已经使用到了
三、CSS3背景
background-size 规定背景图片的尺寸
body{ background-image: url("1.jpg"); background-repeat: no-repeat; background-size: 600px 600px;}
background-origin 规定背景图片的定位区域
background-clip 规定背景的绘制区域

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.

HTML defines the web structure, CSS is responsible for style and layout, and JavaScript gives dynamic interaction. The three perform their duties in web development and jointly build a colorful website.


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