head first html with css xhtml

CSS3 Border-radius PropertiesDefinition and usageThe Border-radius property is a shorthand property for setting four Border-*-radius properties.Tip: This property allows you to add rounded borders to elements!1 DOCTYPE HTML>2 HTMLLang= "en">3 Head>4 MetaCharSet= "UTF-8">5 title>Documenttitle>6 style>7 Div{8 width:200px;9 Height:200px;Ten background:Red; One Border-radius:10px 40px 70px 100px; A

A. Use CSS abbreviations Using abbreviations can help reduce the size of your CSS files and make it easier to read. The main rules for CSS abbreviations refer to the common CSS abbreviation syntax summary, which does not expand the description. two. Define units clearly, unless the value is 0 Forgetting to define t

the following but not limited to: Mastering the meaning and usage of common HTML tagsAbility to properly plan HTML document structures based on design draftsUnderstand semantics and use HTML tags wisely to build pagesMaster the basic CSS coding, including the following but not limited to: Understand the d

CSS is all called Cascading style sheets.CSS BASIC Syntax structureCSS rules consist of two parts: selectors and declarations. The declaration must be placed in curly braces {}, and the declaration can be one or more, and each declaration consists of a property and a value separated by a colon, with each statement ending with a semicolon. as shown below.h1{font-size:12px;Color: #F000;}font-size:12px; and color: #F000; represents two declarations in wh

standard requirements. XHTML 1.0 does not define any new elements and attributes, but inherits all elements and attributes of HTML 4.0. Therefore, XHTML 1.0 is compatible with HTML 4.0. XHTML 2.0 has greatly improved XHTML 1.0, a

first, web standards1.1 Structure(1) XHTML (extensible Hypertext Markup Language) Extensible Hypertext Markup Language(2) World Wide Web Consortium WWW AllianceA, the structure (XHTML, XML), Performance (CSS), standards.1.2 Performance(1) CSS (cascading style sheets) cascading style Sheets1.3 Behavior(1) ECMA (Europan

;data-" to avoid using "data: "And other naming methods;6. Semantic html. For example, if the title uses h based on importance (only one h1 can be found on the same page), p is used for Section marking, ul is used for the list, and block-level elements cannot be nested in inline elements;7. Minimize div nesting8. Avoid redirection when writing the link address. For example, href = "http://www.example.com/" must be added after

. This process is called a nested tag. The tag closest to the content of the nested tag must be ended first, in the order of internal and external.4. Standard attributes HTML tags can have attributes. Attribute provides more information about HTML elements. Attribute always appears in the form of name = "value. For example, name = "form1", where "name" is the property name, and "form1" is the property value

or for the language of some Web pages. This is helpful for search engines and browsers.according to the recommendation criteria, you should declare the primary language on each page through the lang attribute in the Xhtml XHTML is a more rigorous and pure HTML version. XHTML is almost identical to

First, the CSS definition(cascading style sheets) cascading style SheetsPerformance of standard language, control of the display of web informationsecond, the establishment of CSS2.1 Internal Establishment(built in head with tag Description: (1) div is a selector, {} is a declaration, Width/height is a property, 300px is a property value(2) Border is a property, it has three attribute values, 1px border wid

A recent article on trim (Frames) gave me the idea of the current state of web design. Not long ago, many web page standards were published. The advantages of developing web applications using CSS and XHTML are gaining popularity, but many developers still rely more on HTML tables to control page output. Let's take a look at the advantages of using