An overview

1. What is HTML?

HyperText Markup Language, Hypertext Markup Language, client-side technology, responsible for page display.

2. Characteristics of HTML

Tags are not case-sensitive.

3. Request address

HTML is the basis of client technology. HTML runs on the client and faces the entire Internet. In order to ensure correct To locate resources locally, when writing the request address , the complete format must be written, and the relative format cannot be used because there is no relative resource on the client.

Two tags

1. Various tags (jstl) or expression languages ​​are improvements to the JSP page writing method, mainly used In order to reduce the nesting of java code, it can only be used in JSP files and cannot be used in HTML files.
2.: Define a default root path for all relative paths used in the page, that is, when accessing a certain path on the page Add the root path defined by the

tag in front of the path. The defined default root path must end with "/". 3.radio/checkbox/select: The text displayed in the radio and checkbox is only a prompt message, not the data transmitted to the server when the data is submitted. It needs to be

in the label The value passed when the tag is selected is specified internally through the value attribute. 4.: used to load external files to the browser.

can only be used within the tag.
#ref: Defines the relationship between the external document and the calling document.
#type: Defines the MIME of the document. MIME, Multipurpose Internet Mail Extension, specifies an application that opens files with a certain extension. When the browser receives the file, it first checks the MIME of the file, and then calls the corresponding application to open the file. The server must specify MIME for the response, otherwise the browser cannot open it.
#href="": The path of the called file.
Example:

1. : Insert an image in the page title.

2. ## 5. The

   tag is a block object, which occupies one line by default. You can use the CSS attribute float to move the

   object so that it only Occupies the specified space and releases the remaining space in line

for use by other elements.

Three forms

1.Hidden function

Hidden domain hidden does not take up space, use Used to send data to the server that does not require direct user input, such as certain calculation data and built-in data.

2. Data submission form

Form input transmits data to the server in the form of a character array.

3. True and false attributes

Part of the judgment attributes in the form input tag (the value is false or true), when If the value is true, you can omit true and only write the attribute name. This point is different from the Strust tag. If an attribute in the Struts tag has a value of true, you must completely write out the statement that assigns a value of true.

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