


附录: HTML Cheat Sheet
IE无法正确显示页面主体周围的边框 body{border:}
index.html#id 用id链接到页面元素
像素:你的计算机显示屏是由树百万个称为像素的点组成的
换行,void类型的元素 XHTML中更严格的语法要求
-
块元素
行内元素
- 根据具体的上下文,既可以是内联元素也可以是块元素,因为它可以包含块元素,而不仅仅是文本
-
是块元素和内联元素之间的模糊地段,它的确会创建一个换行,但不会像那样把一个文本分成单独的两块
-
是内联元素,它不会在前面或者后面插入换行, alt属性指定描述这个图像的一些文本 。浏览器是在下载了html文件并开始显示页面之后才开始下载图像,如果为img提供了width和height属性,浏览器在显示图片之前就可以开始建立页面布局,如果没有指定,则浏览器在下载图像之后才能知道大小,需要重新调整页面布局 为什么不能直接使用width和height来调整图片的大小?因为浏览器在缩放图像使之适应页面大小之前,仍然需要获取整个大图像。width和height属性实际上是帮助浏览器确定要为这个图像预留多大的空间,如果要使用这两个属性,则它们应当与图像的实际宽度和高度一致
表格: ordered list
unordered list
-
- list item
定义列表
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- 定义术语
-
- 定义描述
- HTML 实体:
在 HTML 中,某些字符是预留的。
在 HTML 中不能使用小于号(),这是因为浏览器会误认为它们是标签。
如果希望正确地显示预留字符,我们必须在 HTML 源代码中使用字符实体(character entities)。
参考链接:HTML ISO-8859-1 参考手册
字符实体类似这样:
- < <
-
- > & ©right;
注释:实体名称对大小写敏感!实体数字被浏览器支持的更好
HTML不会再有6,7,8 HTML不会再有版本6、7、8….制定标准的人已经把这个规范变成了一个活的标准,它会随着技术的发展形成相应文档。所以,不再有版本号,你甚至可以不把它叫做HTML5,因为从现在开始,它只是“HTML”
向后兼容性(backwords compatibility)表示我们可以继续向HTML增加新的内容,浏览器最终会支持这个新内容,不过它们还是会继续支持原来的内容
meta表示我们要告诉浏览器关于页面的一些信息,在meta的charset属性中指定字符编码,字符编码为我们提供了一种方法,可以在计算机上表示某种语言中的所有字母数字和其他符号。如今标准已经统一为Unicode编码。utf-8是unicode序列中的一个编码,web页面中使用的就是utf-8
块元素
行内元素
是块元素和内联元素之间的模糊地段,它的确会创建一个换行,但不会像
那样把一个文本分成单独的两块
为什么不能直接使用width和height来调整图片的大小?因为浏览器在缩放图像使之适应页面大小之前,仍然需要获取整个大图像。width和height属性实际上是帮助浏览器确定要为这个图像预留多大的空间,如果要使用这两个属性,则它们应当与图像的实际宽度和高度一致
表格:- ordered list
- unordered list
定义列表
在 HTML 中,某些字符是预留的。
在 HTML 中不能使用小于号(),这是因为浏览器会误认为它们是标签。
如果希望正确地显示预留字符,我们必须在 HTML 源代码中使用字符实体(character entities)。
参考链接:HTML ISO-8859-1 参考手册
字符实体类似这样:
注释:实体名称对大小写敏感!实体数字被浏览器支持的更好
HTML不会再有6,7,8HTML不会再有版本6、7、8….制定标准的人已经把这个规范变成了一个活的标准,它会随着技术的发展形成相应文档。所以,不再有版本号,你甚至可以不把它叫做HTML5,因为从现在开始,它只是“HTML”
向后兼容性(backwords compatibility)表示我们可以继续向HTML增加新的内容,浏览器最终会支持这个新内容,不过它们还是会继续支持原来的内容
meta表示我们要告诉浏览器关于页面的一些信息,在meta的charset属性中指定字符编码,字符编码为我们提供了一种方法,可以在计算机上表示某种语言中的所有字母数字和其他符号。如今标准已经统一为Unicode编码。utf-8是unicode序列中的一个编码,web页面中使用的就是utf-8

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.

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.


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