一,background-clip:border-box 默认/ padding-box / content-box;背景被裁剪到边框 / 内边距 / 内容区,css3属性。兼容写法如下:
<span style="font-size: small;"> -webkit-background-clip: padding-box; -moz-background-clip: padding; background-clip: padding-box;<br><br></span><span style="font-size: small;">二,雪碧图。</span>
<span style="font-size: small;">CSS Split,中文名<a class="baidu-highlight" href="https://www.baidu.com/s?wd=CSS%E9%9B%AA%E7%A2%A7&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1dWrAczP1-WPAn1mh7-uHfv0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3EnHfYn1D3nWc3" target="_blank">CSS雪碧</a>图。 简单的就是说,通过背景定位,将许多小的图片放在同一张大图上面,减少<a class="baidu-highlight" href="https://www.baidu.com/s?wd=HTTP%E8%AF%B7%E6%B1%82&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1dWrAczP1-WPAn1mh7-uHfv0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3EnHfYn1D3nWc3" target="_blank">HTTP请求</a>次数,加速网站。要做到这一点需要两个技术: 1.CSS技术</span>
<span style="font-size: small;"> background:#color url(#image_src) #left #top #repeat; 参数说明: #color:图片没有显示之前的颜色,透明的话,不填写 #image_src:<a class="baidu-highlight" href="https://www.baidu.com/s?wd=%E8%83%8C%E6%99%AF%E5%9B%BE%E7%89%87&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1dWrAczP1-WPAn1mh7-uHfv0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3EnHfYn1D3nWc3" target="_blank">背景图片</a>地址 #left:图片水平方向的偏移量 #top:图片垂直方向的偏移量 #repeat:当容器大于图片大小时,背景扩展方式 2.PS合成图片的定位 =============== 示例: PS制作大图片时,定位一个图片的位置为(10,20) 那么CSS应该这样写 background: url("../background.png") 10px 20px no-repeat;</span>
<span style="font-size: small;">三,</span>
min-width: 160px; _width:160px; 最小宽高度这样写。
四,
-webkit-box-shadow: 0 5px 10px rgba(0,0,0,0.2); -moz-box-shadow: 0 5px 10px rgba(0,0,0,0.2); box-shadow: 0 5px 10px rgba(0,0,0,0.2);阴影写法。
五,JavaScript 放置在文档最后面可以使页面加载速度更快。

The roles of HTML, CSS and JavaScript in web development are: 1. HTML defines the web page structure, 2. CSS controls the web page style, and 3. JavaScript adds dynamic behavior. Together, they build the framework, aesthetics and interactivity of modern websites.

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.

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.


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