Chapter 1 CSS and Documents
CSS: cascading style sheet
W3C: world wide web consortiam
Element is a document Basic, divided into
In HTML and XHTML, block-level elements cannot inherit their own internal elements, and CSS has no restrictions on how roles can be nested
If a title is specified for a link whose rel is stylesheet, it also specifies that the style sheet should be used as the preferred style sheet (preferred style sheet). If If a group of style sheets is designated as the preferred style sheet, then only one of them will be used
Document style sheet, nested style sheet
Backward accessibility: Include the declaration in an HTML comment tag. Older browsers that do not support style will ignore the style, and subsequent declarations will be commented out.
CSS comments: /* */ Nesting is not supported
Each style sheet is composed of A series of rules composed of
Rules: selector Declaration block
Declaration block consists of one or more declarations, each declaration is an attribute-value pair ( property-value)
Element selector: HTML element
In almost all cases, the value is either a keyword or a list of keywords that can be used for the property, one of the keywords Separate them with spaces. If incorrect attributes or values are used in the declaration, the entire declaration will be ignored
Special case: h2 {font: large/150% sans-serif}; Slashes are used to separate setting fonts Two keywords for size and row height
Selector grouping: Separate different selectors with commas
Universal selector: Displayed as a * and can be used with any element Match
declaration grouping: add a semicolon at the end of each declaration. Usually a grouping that combines selectors and declarations
class selector: to apply styles regardless of the specific elements involved .class{property:value}

HTMLisnotaprogramminglanguage;itisamarkuplanguage.1)HTMLstructuresandformatswebcontentusingtags.2)ItworkswithCSSforstylingandJavaScriptforinteractivity,enhancingwebdevelopment.

HTML is the cornerstone of building web page structure. 1. HTML defines the content structure and semantics, and uses, etc. tags. 2. Provide semantic markers, such as, etc., to improve SEO effect. 3. To realize user interaction through tags, pay attention to form verification. 4. Use advanced elements such as, combined with JavaScript to achieve dynamic effects. 5. Common errors include unclosed labels and unquoted attribute values, and verification tools are required. 6. Optimization strategies include reducing HTTP requests, compressing HTML, using semantic tags, etc.

HTML is a language used to build web pages, defining web page structure and content through tags and attributes. 1) HTML organizes document structure through tags, such as,. 2) The browser parses HTML to build the DOM and renders the web page. 3) New features of HTML5, such as, enhance multimedia functions. 4) Common errors include unclosed labels and unquoted attribute values. 5) Optimization suggestions include using semantic tags and reducing file size.

WebdevelopmentreliesonHTML,CSS,andJavaScript:1)HTMLstructurescontent,2)CSSstylesit,and3)JavaScriptaddsinteractivity,formingthebasisofmodernwebexperiences.

The role of HTML is to define the structure and content of a web page through tags and attributes. 1. HTML organizes content through tags such as , making it easy to read and understand. 2. Use semantic tags such as, etc. to enhance accessibility and SEO. 3. Optimizing HTML code can improve web page loading speed and user experience.

HTMLisaspecifictypeofcodefocusedonstructuringwebcontent,while"code"broadlyincludeslanguageslikeJavaScriptandPythonforfunctionality.1)HTMLdefineswebpagestructureusingtags.2)"Code"encompassesawiderrangeoflanguagesforlogicandinteract

HTML, CSS and JavaScript are the three pillars of web development. 1. HTML defines the web page structure and uses tags such as, etc. 2. CSS controls the web page style, using selectors and attributes such as color, font-size, etc. 3. JavaScript realizes dynamic effects and interaction, through event monitoring and DOM operations.

HTML defines the web structure, CSS is responsible for style and layout, and JavaScript gives dynamic interaction. The three perform their duties in web development and jointly build a colorful website.


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