/* mozilla.org Base Styles * maintained by fantasai * (classes defined in the Markup Guide - http://mozilla.org/contribute/writing/markup ) *//* Suggested order: * display * list-style * position * float * clear * width * height * margin * padding * border * background * color * font * text-decoration * text-align * vertical-align * white-space * other text * content * *//* TOC: Random HTML Styles Forms General Structure Navigation Quotations Comments and Other Asides Emphasis Computers - General Code Examples and Figures Q and A (FAQ) Tables Headers Meta Specific to Products Pages*//* Random HTML Styles */ dt { font-weight: bold; } dd { margin: 0 0 1em 1em; } li { margin-top: 0.2em; margin-bottom: 0.2em; } sup { font-size: 70%; } form { margin: 0; display: inline; } label { font-weight: bold; }/* General Structure */ .subtitle { font-style: italic; } div.para { margin: 1em 0; } div.para > ul, div.para > ol, div.para > blockquote { margin-top: 0.2em; margin-bottom: 0.2em; } div.section { display: block; padding-left: 3%; } div.section > h2, div.section > h3, div.section > h4, div.section > h5, div.section > h6 { margin-left: -1.3%; } .block { display: block; margin: 0.1em 1em; } .imgright { float: right; margin: 0 0 2em 2em; } .first { margin-top: 0; /* For IE not understanding :first-child */ }/* Navigation */ :link img, :visited img { border: 0; } .deepLevel #mainContent :link img, .deepLevel #mainContent :visited img { border: medium solid; } .deepLevel #mainContent #buttons :link img, .deepLevel #mainContent #buttons :visited img { border: 0; } .ex-ref { font-style: italic; } dl.toc dt { margin-top: 1em; font-size: 110%; } dl.toc p { margin: 0; text-indent: 1em; } dl.toc p:first-child { text-indent: 0; } dl.toc > dd { margin-left: 1em; } ol.toc ol { list-style-type: circle; } ol.toc > li > ol { font-size: 90%; } ul.snav {/* section navigation or short navigation, whichever you prefer */ margin: 0.7em 10%; padding: .2em; text-align: center; list-style-type: none; } ul.snav > li { margin: 0; padding: 0; } ul.snav > li { display: inline; } ul.snav > li:before { content: " | "; } ul.snav > li:first-child:before { content: ""; } @media screen, print, handheld, projection { p.crumbs em { display: none; } } #mainContent > p.crumbs:first-child, #side > p.crumbs:first-child { margin-top: 0; } a.cont { display: block; margin-right: 0; text-align: right; }/* Quotations */ blockquote > address { padding-left: 1em; text-indent: -1em; } blockquote > address:before { content: "\2015"; } div.quote, div.epigraph { margin: 1em; } div.quote q, div.epigraph q { display: block; margin: 0 .5em; text-indent: -0.5em; } div.quote cite, div.epigraph cite { display: block; padding: 0 1em; text-align: right; text-indent: -1em; } div.quote cite:before, div.epigraph cite:before { content: "\2015"; } blockquote.epigraph, div.epigraph q { font-style: italic; text-align: right; } blockquote.epigraph em, div.epigraph q em { font-style: normal; } blockquote.epigraph address, div.epigraph cite { font-style: normal; }/* Comments and other Asides */ .note { font-style: italic; } .note:before { content: "Note: "; } .remark { font-size: smaller; } .remark:before { content: "["; } .remark:after { content: "]"; } .sidenote { clear: both; margin: 0.75em 0.5em; padding: 0.2em; border: 1px solid; /* Block NS4 from floating */ /*/*/ float: right; width: 30%; min-width: 15em; /* */ } /* Reduce main header sizes */ .sidenote h1 {font-size: 1.40em;} .sidenote h2 {font-size: 1.25em;} .sidenote h3 {font-size: 1.10em;} .key-point > h1:first-child, .key-point > h2:first-child, .key-point > h3:first-child, .key-point > h4:first-child, .key-point > h5:first-child, .key-point > h6:first-child { margin-top: 0; }/* Emphasis */ /* em, strong */ strong.stronger { font-style: italic; font-weight: bold; } strong.very-strong { font-weight: bold; text-transform: uppercase; } *.important, div.important, p.important { margin: 1em; padding: 0.1em; border: solid #F00; font-size: larger; } span.important { margin: 0; padding: 0; border: 0; font-size: smaller; color: #c00; }/* Computers - General */ pre.screen { overflow: auto; margin: 1em 0.5em; padding: 0.2em; border: solid 1px; font-family: monospace; white-space: pre; } div.screen { margin: 1em .5em; padding: 0.2em; border: solid 1px; } span.application { font-style: italic; } kbd.long { display: block; margin: 0.1em 1em; } kbd.command, code.command { white-space: pre; } code.filename { font-style: italic; white-space: nowrap; }/* Code */ code, pre { /* override IE6 default */ font-size: 1em; } code { white-space: nowrap; } code.long { display: block; margin: 0.1em 1em; white-space: normal; } pre.code { overflow: auto; margin: 1em .5em; padding: .2em; border: solid 1px; } pre.code .remark { font-size: 1em; font-style: italic; } /* turn off content generation */ pre.code .remark:before, pre.code .remark:after, pre.code .note:before { content: ""; }/* Examples and Figures */ .example { margin: 1em 3%; padding: .25em; border: solid; } .example:before { display: block; font-weight: bold; content: "Example"; } .example[title]:before { content: "Example: " attr(title); } pre.bad, div.bad { border: dashed red 3px; } .bad.example:before { content: "Incorrect Example"; } .bad.example[title]:before { content: "Incorrect Example: " attr(title); } pre.good, div.good { border: double lime 3px; } .good.example:before { content: "Correct Example"; } .good.example[title]:before { content: "Correct Example: " attr(title); } .figure, .screenshot { display: block; margin: .75em auto; } object.figure object, object.screenshot object, object.figure img, object.screenshot object { display: block; margin: 0 auto; } .screenshot[title]:after, .figure[title]:after { display: block; margin: 0 8% .05em; font-style: italic; font-size: small; text-align: right; content: attr(title); } .co, .callout { text-decoration: underline; }/* Q and A (FAQ) */ .qandaset .question { font-size: large; font-weight: bold; } .qandaset .answer { margin-top: 1em; }/* Tables */ table.data { border-collapse: collapse; margin: 0.5em auto; border: 1px solid; } table.data caption { margin: 1em auto 0.2em; font-size: small; font-style: italic; text-align: center; } table.data th, table.data td { padding: 0.2em; border: 1px solid; vertical-align: baseline; } table.data tbody th:first-child { text-align: right; } table.data thead th { vertical-align: middle; }/* Meta */ address { text-align: right; } .author { margin-bottom: 1em; text-align: left; }/* Headers */ #mainContent > h1:first-child, #mainContent > h2:first-child, #mainContent > h3:first-child, #mainContent > h4:first-child, #mainContent > h5:first-child, #mainContent > h6:first-child, #side > h1:first-child, #side > h2:first-child, #side > h3:first-child, #side > h4:first-child, #side > h5:first-child, #side > h6:first-child { margin-top: 0; } /* Specific to Products Pages */.productlist { margin: 0; padding: 0 0 0 5px;}.productlist li { clear: left; list-style: none; padding: 0 0 1em 0; margin-left: 0;}.productlist h3 { margin: 0 0 0.2em 0;}.productlist img { float: left; margin: 0 0.5em 1em 0;}/* Random Stuff That Needs To Be Cleaned Up / Deprecated */.flLeft { float: left; margin: 5px 10px 5px 0;}.flRight { float: right; margin: 5px 0 5px 10px;}

HTMLtagsdefinethestructureofawebpage,whileattributesaddfunctionalityanddetails.1)Tagslike,,andoutlinethecontent'splacement.2)Attributessuchassrc,class,andstyleenhancetagsbyspecifyingimagesources,styling,andmore,improvingfunctionalityandappearance.

The future of HTML will develop in a more semantic, functional and modular direction. 1) Semanticization will make the tag describe the content more clearly, improving SEO and barrier-free access. 2) Functionalization will introduce new elements and attributes to meet user needs. 3) Modularity will support component development and improve code reusability.

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.


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