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What is HTML?
※ Hypertext Markup Language (hypertext Markup language,html) marks the various parts of the page to be displayed, a set of rules, and the rules that the browser recognizes by using the tag language.
※ The browser renders the Web page file sequentially, then interprets and displays the content according to the marker, but it is important to note that for different browsers, the same tag may be interpreted differently (compatible).
※ Static Web page file extension: HTML or HTM
HTML is not a programming language, but a markup language (markup language)
HTML uses tag tags to describe web pages
HTML structure
HTML tag format
Syntax for Tags:
< Tag Name Property 1 = "Property value 1" Property 2 = "Property value 2" ......> content section </tag name >
< Tag Name Property 1 = "Property value 1" Property 2 = "Property value 2" .../>
<! The doctype> declaration is positioned at the front of the document, before the
Function: Declares the parsing type (document.compatmode) of the document, avoiding the bizarre mode of the browser.
Document.compatmode:
This property will be recognized and used by the browser, but if your page does not have a DOCTYPE declaration, the Compatmode default is Backcompat
Commonly used tags in
<meta> TagsMeta Introduction
The <meta> element provides meta-information about the page (meta-information), a description of the search engine and the frequency of updates, and keywords.
The <meta> tag is located in the header of the document and does not contain any content.
The information provided by <meta> is not visible to the user
Meta tag composition: Meta tags have two attributes, which are the Http-equiv property and the Name property, and different properties have different parameter values, these different parameter values to achieve a different page function.
(1) Name attribute: Mainly used to describe the Web page, the corresponding property value of content,content content is mainly for the search engine to find information and classification information.
<meta name= "keywords" content= "meta Summary, HTML Meta,meta properties, meta jump" > <meta name= "description" content= " The old boy training institution was created by a very old boy ">
(2) Http-equiv property: equivalent to the file header of HTTP, it can send back some useful information to the browser to help correctly display the content of the Web page, the corresponding property value of Content,content is actually the variable value of each parameter.
Non-META tags
Basic labels for common labels in <body> ( block-level labels and inline labels）<title>oldboy</title> <link rel= "icon" href= "Http://www.jd.com/favicon.ico" > <link Rel= "stylesheet" href= "Css.css" > <script src= "Hello.js" ></script>
"<HN>: the value range of n is 1~6; From big to small. Used to denote a title. <p>: paragraph label. The contents of the package are wrapped. And there is a line between the contents of the content .<b> <strong>: Bold label. <strike>: Adds a median line to the text. <em>: text becomes italic .<sup> and <SUB>: Upper corner and Lower corner table. <br>: newline.<div> and <span><div></div>: <div> is just a block-level element that has no practical meaning. It is mainly given a different performance by CSS styles.
<span></span>: <span> represents inline rows (inline elements) and has no practical meaning, and is mainly given a different representation by CSS styles.The difference between a block-level element and an in-line element
Graphic Tags: hyperlink tags (anchor tags): <a> </a>
The so-called block element is the element that begins to render on another line, and the inline element does not need another line. If you insert these two elements separately in a Web page, you will not have any effect on the page.
These two elements are specifically designed to define a CSS style.What is a hyperlink? A hyperlink is a link from a Web page to a target, which can be another page, a different location on the same page, a picture, an e-mail address, a file, or even an application.What is a URL? The URL is the abbreviation for the Uniform Resource Locator (Uniform Resource Locator), also known as the Web address, which is the address of the standard resource on the Internet. URL example Http://www.sohu.com/stu/intro.htmlhttp://222.172.123.33/stu/intro.htmlURL address consists of 4 parts of the 1th part: for the Agreement:/HTTP, ftp://, etc. Part 2nd: For the site address: can be a domain name or IP address part 3rd: The directory for the page in the site: Stu Section 4: For the page name, for example, index.html the "/" symbol between the sections separated"' <a href=" "target=" _blank ">click</a>href property specifies the destination page address. The address can have several types: absolute URL-point to another site (such as href= "http://www.jd.com) relative URL-refers to the exact path in the current site (href=" index.htm ") anchor URL- Point to the anchor in the page (href= "#top")Table Tags: <table>"' <ul>: unordered list [type attribute: disc (solid dot) (default), Circle (Hollow Circle), Square (solid square)]<ol>: Sequence table <li>: Each item in the list .< dl> Define list <dt> list title <dd> list item 'Tabular Concepts
A table is a two-dimensional data space, a table consists of several rows, a row and a number of cells, cells can contain text, lists, patterns, forms, digital symbols, preset text and other tables and other content.
The most important purpose of the table is to display the table class data. Tabular data refers to data that best fits into a tabular format, which is organized by rows and columns.
The basic structure of the table:<table> <tr> <td> title </td> <td> title </td> </tr> <tr> <td> content </td> <td> content </td> </tr></table>Forms Tags: <form>"' <tr>: Table row<th>: Table head cell<td>: Table Data cell property: border: Table border. cellpadding: Inner margin cellspacing: margin. Width: Percentage of pixels. (preferably with CSS to set the length and width) rowspan: How many rows the cell spans vertically colspan: how many columns (i.e. merged cells) the cells spanFeatures: forms are used to transfer data to the server, enabling users to interact with the Web server
The form can contain input series labels such as text fields, checkboxes, radio boxes, submit buttons, and so on.
Forms can also contain textarea, select, FieldSet, and label labels.
Form Properties
Action: Where the form is submitted. Generally point to the server side of a program, the program receives the form submitted by the data (that is, the form element value) for the corresponding processing, such as Https://www.sogou.com/web
Method: How the form is submitted post/get default value is get
Form elements
Basic concepts:
HTML forms are a more complex part of HTML elements, and forms are often combined with features such as scripting, dynamic pages, and data processing, so it's important to make dynamic Web sites.
Forms are typically used to collect user input information
How the form works:
When a visitor browses a page with a form, they can fill in the necessary information and then press a button to submit it. This information is transmitted over the Internet to the server.
This data is processed by a specialized program on the server and returns an error message if there is an error and requires that the error be corrected. When the data is complete and correct, the server feeds back an input completion information<input> Series Labels
' <1> form type
type:text text input box password password input box Radio single marquee checkbox multiple selection Box Submit Button button (required with JS to use.) What is the difference between button and submit? File submission: Form form needs to add attribute enctype= "multipart/form-data" upload file note two points: 1 The request must be a post 2 enctype= "Multipart/form-data"
<2> Form Properties
Name: The key of the form submission item. Note the difference from the id attribute: The name attribute is the one used when communicating with the server, and the id attribute is the name used by the browser side, which is primarily for client programming, and the value used in CSS and javascript: The values of the form submission items. For different input types, The use of the Value property is also different: type= "button", "Reset", "submit"-defines the displayed text on the button type= "text", "Password", "hidden"-defines the initial value of the input field type= "checkbox", "Radio", "image"-defines the value associated with the input checked: Radio and checkbox are selected by default ReadOnly: Read only. Text and passworddisabled: works well for the input used.
Select label
' <select> drop-down tab Property name: The key of the form submission item. Size: Number of options Multiple:multiple <optgroup> for each item plus group <option> drop-down check each property: value: The values of the form submission item. Selected:selected dropdown selected by default "'
<textarea> Multi-line text box"' <form id=" Form1 "Name=" Form1 "method=" Post "action=" "> <textarea cols=" width "rows=" height "name=" name "> Default content </textarea></form> "'<label> tags
Define the:<label> label to define the callout (tag) for the INPUT element.
Description
1 The Label element does not present any special effects to the user.
2 The For property value of the <label> tag should be the same as the id attribute value of the related element"<form method=" post "action=" "> <label for=" username "> user name </label> <input type= " Text "name=" username "id=" username "size=" "/></form>"<fieldset> tags' <fieldset> <legend> login </legend> <input type= ' text ' ></fieldset> ' ' 3html-Front-End Basics
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