Web front end -- HTML

Hee hee hee hee hee 2020-11-13 01:57:49
web end html


HTML

One 、Web Introduction to front end development

Web summary

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Web origin

1984 Tim Berners Lee created the world's first World Wide Web navigation site, the world's first website
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Web The characteristics and working principle of

1. Easy navigation and graphical interface
2. It's not about the platform
3. Distributed structure
4. dynamic
5. Interactivity
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URL Introduce

URL Unified resource locator can be understood as a web address .
The composition is as follows :
Protocol type :// Server address ( Port number )/ route / file name
Example :
http://www.westos.org/bbs/index.html

Two 、HTML Web page structure

  • HTML(Hyper Text Mark-up Language ) It's hypertext markup language , A language that describes the structure and presentation of a page document by using tag tags , Then the browser will parse it , And then show the results on the web page .

  • Hypertext refers to hyperlinks
    A mark is a label

  • 1).HTML The file is opened with an editor to display the text , It can be written Ben's way of editing .

  • 2). HTML File open with browser , The browser will render the file as a web page according to the label description , The displayed page can be from a web page Links jump to another page .

HTML Basic structure

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HTML The document type

The two types of documents commonly used at present are xhtml 1.0 and html5
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HTML Document specification and annotation

xhtml The standard of document writing has been established ,html5 Can be partially complied with , You can also comply with all of them , Look at the development requirements .
1、 All labels have to be lowercase
2、 All attributes must be enclosed in double quotation marks
3、 All labels must be closed
4、img Must add alt attribute ( Description of the picture )

HTML notes

html Comments can be inserted into the document code , Comments are the explanation and explanation of the code , The content of the comment will not be displayed on the page ,html Insert comments into the code Approach is to :

<!-- This is a comment -->

3、 ... and 、HTML label

Text label

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Line wrap label

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Tabs tab

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div And span label

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Picture label

Tag definition HTML Images on the page . There are two required properties :src and alt.
attribute :src: Picture name and url Address title: Text prompt properties
alt: Tips for image loading failure width/height: Image width / Height

Hyperlink label

Hyperlink tags
attribute :
href: must , Refers to the link jump address ;
target: Indicates how the link is opened .
_blank New window ,
_self This window ( Default )
title: Text prompt properties

  • Anchor point
    Anchor link :
    1. Define an anchor point :
      use Baidu Search
    2. Use anchors :
    
    <a href="#a1"> Jump to the a1 It's about </a>
    
Tabular label

stay HTML In the document , Tables are widely used to store text and images on Web pages ; Insert picture description here

  • label :
    Tabular label :table
    Row labels :tr
    Cell ( Represents the concept of columns ):td
    Header :th : Bold and centered
    Table title :caption
    Label merging :
    merger :rowspan
    columns :colspan
  • Common attributes of label :
    border: Frame
    width: Width
    height: Height
    algin: Alignment mode
    center,left,right
Form labels

Common properties :
action attribute : Target address for submission (URL)
method attribute : submission :get( Default ) and post
get The way :
URL The address bar can be seen
The length is limited
Relatively unsafe .
post The way :
URL The address is not visible
The length is unlimited
A relatively safe .

Form item labels

Form item labels input Define input fields , Users can enter data in it .
stay HTML 5 in ,type Attributes have a lot of new values .
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Drop down list label
<select>...</select> Tag create drop-down list .
name attribute : Definition name , Used to store drop-down values
size: Define the number of visible items in the menu ,html5 I won't support it
disabled When the attribute is true when , The menu will be disabled .
multiple multi-select
<option>... </option> Drop down selection tab , For embedding into <select> Used in the label ;
*value attribute : The value of the dropdown
*selected attribute : By default, drop-down the specified item .
Text field labels

… Multi line text input area
name : Definition name , Used to store values in the text area .
cols : Specifies the number of columns visible in the text area .
rows : Specifies the number of lines visible in the text area .
disabled: Whether to disable
readonly: read-only

Button label
<button>...</button> Label definition button .
<fieldset> --fieldset Element to group related elements in the form .

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html Embedded frame
<iframe> The tag is created to contain another html File inline framework ( That's the inside frame ),
src Property to define another html Reference address of the document
frameborder Property defines the border ,
scrolling Whether the property definition has a scroll bar ,
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