Front-End HTML Summary 1.0——introduce HTML skeleton tag

    1. Introduction to HTML

    • HTML stands for Hypertext Markup Language (Hyper Text Markup Language) is a language used to describe web pages.
    • HTML is not a programming language, but a markup language
    • A markup language is a set of markup tags

    A web page is composed of web elements, which are described by html tags, and then parsed by the browser, and displayed to the user.

    The so-called hypertext has two meanings:

    1. Because it can add pictures, sounds, animations, multimedia and other content (beyond the text limit)
    2. Not only that, it can jump from one file to another, linking with files from hosts around the world (hyperlink text).

    html summary:

    • html is a hypertext markup (tag) language
    • We learn html, mainly learn html tags
    • We use html tags to describe web elements. Such as image tags, text tags, link tags, etc.
    • tags have their own syntax specifications, all html tags are represented by <>


    1.1 HTML skeleton tag

    In daily life letters, we have to follow a common convention.

    The same is true: HTML has its own language syntax skeleton format: (to follow, to be professional) It must be written down fluently

    <head>
   <!-- title tag -->
    <title></title>
</head>
  <!-- The body of the document -->
<body>
</body>
</html>

    html tag

    <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>


    Document Type Declaration <!DOCTYPE>

    usage:

    <!DOCTYPE html>


    effect:

    • The <!DOCTYPE> declaration is placed first in the document, before the tag. This tag tells the browser which HTML or XHTML specification the document uses
    • <!DOCTYPE> is not an HTML tag, it is a doctype declaration tag


    Team Agreement:

    HTML files must add a DOCTYPE declaration and use the HTML5 document declaration uniformly


    page language lang

    <html lang="en"> specifies the html language

    The 2 most common:

    1. en defines the language as English
    2. zh-CN defines the language as Chinese

    The role of lang: According to the lang attribute to set the css style of different languages, or the font to tell the search engine to do accurate identification
    Let the grammar checker do the language recognition
    Help translation tools to identify
    Help web readers do recognition


    character set

    <meta charset="UTF-8" />

    A character set is a collection of multiple characters.

    In order for the computer to accurately process the characters of various character sets, character encoding is required so that the computer can recognize and store various characters.

    utf-8 is the most commonly used character set encoding method at present, and the commonly used character set encoding methods are gbk and gb2312.

    • gb2312 Simple Chinese including 6763 Chinese characters GUO BIAO
    • BIG5 Traditional Chinese for Hong Kong, Macao and Taiwan etc.
    • GBK contains all Chinese characters and is an extension of GB2312, adding support for traditional Chinese characters, compatible with GB2312
    • UTF-8 basically contains the characters that all countries in the world need to use

    PS: For <meta>, <metacharset="utf-8"> ​​should be placed at the top of the head, because it specifies what encoding should be used to parse the entire web page, which is effective Avoid garbled characters

    In addition the element contains the name and content attributes: <meta http-equiv="X-UA-Compatible" content="initial-scale=1.0" name="viewport">

    • name specifies the type of the element; the description should contain information about the type of the element.
    • content specifies the actual metadata content. These two meta elements are used to define the author of your page and provide a brief description of the page Because it might or make your page appear more in relevant searches on search engines (these actions are termed SEO, or SEO.)


    Team convention capitalization

    HTML tag names, class names, tag attributes and most attribute values ​​are all in lowercase

    recommend:

    <head>
    <title>My First Page</title>
</head>

    Not recommended:

    <HEAD>
    <TITLE>My first page</TITLE>
</HEAD>


    1.2 HTML element tag classification

    Label:

    In HTML pages, elements with "< >" symbols are called HTML tags. As mentioned above, <html>, <head>, <body> are all HTML skeleton structure tags.

    Classification:

    1. Regular elements (double tags)
    
<tag name> content </tag name> such as <body> I am text </body>
    • In this syntax, "" indicates the beginning of the function of the tag, generally called "start tag", "</tag name>" indicates the end of the function of the tag, generally called "end tag ( end tag)".
    • Compared with the opening tag, the closing tag is just preceded by a closing character "/".

    • What we will contact in the future are basically double labels

    • Empty element (single tag)

    
<tag name /> e.g. <br />
    • Empty elements are represented by a single tag. Simply put, it does not need to contain content, and only one opening tag does not need to be closed.


    1.3 HTML tag relationship

    There are two main types of interrelationships for dual tags:

    1.Nested relationship

    <head>
    <title></title>
</head>

    2.Parallel relationship

    <head></head>
<body></body>

    Initiative:

    If the relationship between the two tags is a nested relationship, the child element is best indented by a tab key (a tab is 4 spaces). If it is a side-by-side relationship, it is best to align it up and down.

    2. Code development tools (writing code)

    • In order to improve our development efficiency
    • Reduce code errors we do not advocate using Notepad development
    • VScode
    • Dreamweaver
    • SublimeText
    • WebStorm
    • HBuilder


    3. Semanticization of HTML tags

    By tag semanticization, we mean the meaning of tags.

    Give a most reasonable tag in the right place according to the semantics of the tag to make the structure clearer.

    1. facilitate the reading and maintenance of the code
    2. it also allows browsers or web crawlers to parse well and analyze the content better
    3. use semantic tags will have better search engine optimization

    Whether the semantics are good: When we remove the CSS, the web structure is still organized and has good readability.

    The principle to follow: first determine the semantic HTML , then choose the appropriate CSS. so to remember according to the semantics. The implementation of any element in an HTML page relies on HTML tags.

    Popular posts from this blog

    大学资料分享——广工计院各个科目实验报告、课设及期末复习资料！！

    各位师弟师妹，我今年即将从广工毕业，因工作毕设都已差不多完成，整理资料时最终还是决定分享自己大学期间积累的各科资料。本人是广工计院一名本科生，在校绩点四年综合4.0左右，我相信这些资料对你们的学习和实验有非常大的实用性和价值。也真心希望大家能做好时间效率管理，一些不必要的课程不用浪费很多时间，把时间多留给自己所走的方向，希望各位师弟师妹好好利用我的资料，提升自己。如果本篇文章对你有帮助，请多来网站阅览并点击下页面的谷歌广告支持一下，十分感谢~~ 本博客除资源分享外还会 定期发布前端相关的行业动态、前端面试题系列等，后续也会逐步将自己的秋招总结发到谷歌博客上，同方向的师弟师妹们可以关注下，毕竟我也是在最寒冬秋招中获得好几个知名厂offer的，相信对你们将来的工作和面试也会非常实用 。 University special design: Specialised design IPV6 Experiment Report: GDUT IPV6 GDUT matlab digital signal processing experiment report: Matlab Experiment Report The latest operating system experiment and course design report: OS Experiment Report Virtualization and Cloud Computing-Hadoop Deployment Experiment Report: Hadoop Report GDUT C language programming experiment report 1-4: C language programming experiment report Summary of Physics Data of GDUT ： Physics GDUT DEA experiment + big assessment (source code, waveform diagram) + test paper information： EDA Data summary of GDUT Electrician： University Ele
    Read more

    Win10 远程计算机或设备将不接受连接

    Image
    Table Of Contents 错误详情 当晚如平常一样开着clash，但谷歌浏览器显示此网站无法提供安全连接，按网上说的方法改https为http、清除SSL状态缓存、还原浏览器默认设置三个方法后还是没能解决，想起重启能解决99%的问题后果断重启电脑，这也是后面悲剧的开始。 电脑重启后，发现打开浏览器依然无法上网，且火狐浏览器等都出现了一样的问题，通过网络诊断得出原因：远程计算机或设备将不接受连接 百度后发现网上的解决方法千篇一律，都是通过Internet——属性——连接——局域网设置——为LAN使用代理服务器的选项去掉勾选就可恢复（也有说将所有复选框都取消勾选） 我满怀希望的尝试后发现然并卵，虽然提示网络状态已连接Internet但是上不了网。。。后来想了想，可能是因为自己用了翻墙上网然后没有退出就重启的关系（如果没用梯子的兄弟姐妹们可以先尝试我上述的方法，行不通的话再试试我后面的方法） 解决方法 可先尝试重新连接关机时使用的翻墙软件 并正常退出，即可访问网络，如果不行再按以下方法 。 非校园网 重置网络：Internet属性——高级——重置 用了科学上网的同学可能I nternet属性 的常规里主页地址会被篡改，可以手动输入成百度地址 设置完成后点确定，然后重启电脑，此时就能恢复访问了。但出错时如果是用着校园网没有退出科学上网就重启的话，此时用校园网还是上不了网，只能用手机开热点的网络上网，于是进一步摸索 校园网 1.先按非校园网方法重置网络 2.删除电脑科学上网的软件 3.重新认证校园网（可以改个密码重新登录） 呜呜，孩子终于又通网了 总结 科学上网时一定要正常进出网络，不能直接关电脑或者断网，否则IP地址还挂在外面网络回不来，所以记得科学上网时 正常退出后再重启电脑 。
    Read more

    JAVA Traffic Signal Light Course Design (Source Code + Report + Video Demonstration)

    Image
    Table Of Contents topic details Simulate the logic of the traffic light management system at the intersection. 1. Randomly generate vehicles traveling along each route 2. Signal lights ignore yellow lights and only consider red and green lights. 3. It should be considered that vehicles turning left are controlled by signal lights, and vehicles turning right are not controlled by signal lights. 4. The specific signal light control logic is the same as that of ordinary traffic light control logic in real life, regardless of the control logic in special cases: North-south vehicles and east-west vehicles are released alternately. Vehicles waiting in the same direction should pass through vehicles first, and then vehicles turning left. 5. The time for each vehicle to pass through the intersection is 1 second (reminder: it can be simulated by thread sleep). 6. The time interval for randomly generating vehicles and the time interval for exchanging traffic lights i
    Read more