body {/* padding:0; margin : 0;*/}
#head {
/* Margin: 0; Height: 99px;
Background-Image: URL ("Images/Guagua_01.jpg" );
background-repeat:no-repeat;
background-position:center center; margin from the left, margin from the top
*/
/*background:url("images/guagua_01.jpg") left bottom no-repeat; Another way of writing*/
/*background-color:#F00; Red
float:left;
*/
}
div > border :1px solid #ccc; width:50px; height:50px;
*/
}
#container
{
width:560px;
padding:5px;
margin:0 auto;/* Centered (a very common function), but it must be used in conjunction with the two statements above the Html tag, and like < ;Center>This function is rarely used anymore*/ >{ width:100px; height:100px; border:1px solid #ccc; }
#left { float:left; width:400px; }
> #right { float:right; }.clear{clear:both;} /* Because of the floating relationship, it needs to be added, otherwise other DIVs will be separated from the Container DIV. All websites are solved in this way. */.

HTMLattributesarecrucialinwebdevelopmentforcontrollingbehavior,appearance,andfunctionality.Theyenhanceinteractivity,accessibility,andSEO.Forexample,thesrcattributeintagsimpactsSEO,whileonclickintagsaddsinteractivity.Touseattributeseffectively:1)Usese

The alt attribute is an important part of the tag in HTML and is used to provide alternative text for images. 1. When the image cannot be loaded, the text in the alt attribute will be displayed to improve the user experience. 2. Screen readers use the alt attribute to help visually impaired users understand the content of the picture. 3. Search engines index text in the alt attribute to improve the SEO ranking of web pages.

The roles of HTML, CSS and JavaScript in web development are: 1. HTML is used to build web page structure; 2. CSS is used to beautify the appearance of web pages; 3. JavaScript is used to achieve dynamic interaction. Through tags, styles and scripts, these three together build the core functions of modern web pages.

Setting the lang attributes of a tag is a key step in optimizing web accessibility and SEO. 1) Set the lang attribute in the tag, such as. 2) In multilingual content, set lang attributes for different language parts, such as. 3) Use language codes that comply with ISO639-1 standards, such as "en", "fr", "zh", etc. Correctly setting the lang attribute can improve the accessibility of web pages and search engine rankings.

HTMLattributesareessentialforenhancingwebelements'functionalityandappearance.Theyaddinformationtodefinebehavior,appearance,andinteraction,makingwebsitesinteractive,responsive,andvisuallyappealing.Attributeslikesrc,href,class,type,anddisabledtransform

TocreatealistinHTML,useforunorderedlistsandfororderedlists:1)Forunorderedlists,wrapitemsinanduseforeachitem,renderingasabulletedlist.2)Fororderedlists,useandfornumberedlists,customizablewiththetypeattributefordifferentnumberingstyles.

HTML is used to build websites with clear structure. 1) Use tags such as, and define the website structure. 2) Examples show the structure of blogs and e-commerce websites. 3) Avoid common mistakes such as incorrect label nesting. 4) Optimize performance by reducing HTTP requests and using semantic tags.

ToinsertanimageintoanHTMLpage,usethetagwithsrcandaltattributes.1)UsealttextforaccessibilityandSEO.2)Implementsrcsetforresponsiveimages.3)Applylazyloadingwithloading="lazy"tooptimizeperformance.4)OptimizeimagesusingtoolslikeImageOptimtoreduc


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