来自: http://blog.csdn.net/offbye/article/details/50804029
今天帮人解决了iphone4下载页显示错误的问题,css3 media query坑啊,不容易匹配到。
/** * iPhone 4/4s landscape & portrait */@media only screenand (min-device-width: 320px)and (max-device-width: 480px)and (-webkit-device-pixel-ratio: 2)and (device-aspect-ratio: 2/3) { } /** * iPhone 4/4s portrait */@media only screenand (min-device-width: 320px)and (max-device-width: 480px)and (-webkit-device-pixel-ratio: 2)and (device-aspect-ratio: 2/3)and (orientation:portrait) { } /** * iPhone 4/4s landscape */@media only screenand (min-device-width: 320px)and (max-device-width: 480px)and (-webkit-device-pixel-ratio: 2)and (device-aspect-ratio: 2/3)and (orientation:landscape) { } /** * iPhone 5/5s landscape & portrait */@media only screenand (min-device-width: 320px)and (max-device-width: 568px)and (-webkit-min-device-pixel-ratio: 2) { } /** * iPhone 5/5s portrait */@media only screenand (min-device-width: 320px)and (max-device-width: 568px)and (-webkit-min-device-pixel-ratio: 2)and (orientation: portrait) { } /** * iPhone 5/5s landscape */@media only screenand (min-device-width: 320px)and (max-device-width: 568px)and (-webkit-min-device-pixel-ratio: 2)and (orientation: landscape) { } /** * iPhone 5/5s landscape & portrait */@media only screenand (min-device-width: 414px)and (max-device-width: 736px)and (-webkit-min-device-pixel-ratio: 3) { } /** * iPhone 5/5s portrait */@media only screenand (min-device-width: 414px)and (max-device-width: 736px)and (-webkit-min-device-pixel-ratio: 3)and (orientation: portrait) { } /** * iPhone 5/5s landscape */@media only screenand (min-device-width: 414px)and (max-device-width: 736px)and (-webkit-min-device-pixel-ratio: 3)and (orientation: landscape) { } @media only screen and (min-device-width: 375px) and (max-device-width: 667px) and (orientation : portrait) { //iPhone 6 Portrait} @media only screen and (min-device-width: 375px) and (max-device-width: 667px) and (orientation : landscape) { //iPhone 6 landscape }@media only screen and (min-device-width: 414px) and (max-device-width: 736px) and (orientation : portrait) { //iPhone 6+ Portrait} @media only screen and (min-device-width: 414px) and (max-device-width: 736px) and (orientation : landscape) { //iPhone 6+ landscape} @media only screen and (max-device-width: 640px), only screen and (max-device-width: 667px), only screen and (max-width: 480px){ //iPhone 6 and iPhone 6+ portrait and landscape} @media only screen and (max-device-width: 640px), only screen and (max-device-width: 667px), only screen and (max-width: 480px) and (orientation : portrait){ //iPhone 6 and iPhone 6+ portrait} @media only screen and (max-device-width: 640px), only screen and (max-device-width: 667px), only screen and (max-width: 480px) and (orientation : landscape){ //iPhone 6 and iPhone 6+ landscape} /** * Galaxy S3 landscape & portrait */@media screenand (device-width: 320px)and (device-height: 640px)and (-webkit-device-pixel-ratio: 2) { }/** * Galaxy S3 portrait */@media screenand (device-width: 320px)and (device-height: 640px)and (-webkit-device-pixel-ratio: 2)and (orientation: portrait) { }/** * Galaxy S3 landscape */@media screenand (device-width: 320px)and (device-height: 640px)and (-webkit-device-pixel-ratio: 2)and (orientation: landscape) { }/** * Galaxy S4 landscape & portrait */@media screenand (device-width: 320px)and (device-height: 640px)and (-webkit-device-pixel-ratio: 3) { }/** * Galaxy S4 portrait */@media screenand (device-width: 320px)and (device-height: 640px)and (-webkit-device-pixel-ratio: 3)and (orientation: portrait) { }/** * Galaxy S4 landscape */@media screenand (device-width: 320px)and (device-height: 640px)and (-webkit-device-pixel-ratio: 3)and (orientation: landscape) { }/** * Galaxy S5 landscape & portrait */@media screenand (device-width: 360px)and (device-height: 640px)and (-webkit-device-pixel-ratio: 3) { }/** * Galaxy S4 portrait */@media screenand (device-width: 360px)and (device-height: 640px)and (-webkit-device-pixel-ratio: 3)and (orientation: portrait) { }/** * Galaxy S4 landscape */@media screenand (device-width: 360px)and (device-height: 640px)and (-webkit-device-pixel-ratio: 3)and (orientation: landscape) { }/** * HTC One landscape & portrait */@media screenand (device-width: 360px)and (device-height: 640px)and (-webkit-device-pixel-ratio: 3) { }/** * HTC One portrait */@media screenand (device-width: 360px)and (device-height: 640px)and (-webkit-device-pixel-ratio: 3)and (orientation: portrait) { }/** * HTC One landscape */@media screenand (device-width: 360px)and (device-height: 640px)and (-webkit-device-pixel-ratio: 3)and (orientation: landscape) { }/** * iPad Mini landscape & portrait */@media only screenand (min-device-width: 768px)and (max-device-width: 1024px)and (-webkit-min-device-pixel-ratio: 1) { }/** * iPad Mini portrait */@media only screenand (min-device-width: 768px)and (max-device-width: 1024px)and (orientation: portrait)and (-webkit-min-device-pixel-ratio: 1) { }/** * iPad Mini landscape */@media only screenand (min-device-width: 768px)and (max-device-width: 1024px)and (orientation: landscape)and (-webkit-min-device-pixel-ratio: 1) { }/** * iPad 1/2 landscape & portrait */@media only screenand (min-device-width: 768px)and (max-device-width: 1024px)and (-webkit-min-device-pixel-ratio: 1) { }/** * iPad 1/2 portrait */@media only screenand (min-device-width: 768px)and (max-device-width: 1024px)and (orientation: portrait)and (-webkit-min-device-pixel-ratio: 1) { }/** * iPad 1/2 landscape */@media only screenand (min-device-width: 768px)and (max-device-width: 1024px)and (orientation: landscape)and (-webkit-min-device-pixel-ratio: 1) { }/** * iPad 3/4 landscape & portrait */@media only screenand (min-device-width: 768px)and (max-device-width: 1024px)and (-webkit-min-device-pixel-ratio: 2) { }/** * iPad 3/4 portrait */@media only screenand (min-device-width: 768px)and (max-device-width: 1024px)and (orientation: portrait)and (-webkit-min-device-pixel-ratio: 2) { }/** * iPad 3/4 landscape */@media only screenand (min-device-width: 768px)and (max-device-width: 1024px)and (orientation: landscape)and (-webkit-min-device-pixel-ratio: 2) { }/** * Galaxy Tab 10.1 landscape & portrait */@media(min-device-width: 800px)and (max-device-width: 1280px) { }/** * Galaxy Tab 10.1 portrait */@media(max-device-width: 800px)and (orientation: portrait) { }/** * Galaxy Tab 10.1 landscape */@media(max-device-width: 1280px)and (orientation: landscape) { }/** * Asus Nexus 7 landscape & portrait */@media screenand (device-width: 601px)and (device-height: 906px)and (-webkit-min-device-pixel-ratio: 1.331)and (-webkit-max-device-pixel-ratio: 1.332) { }/** * Asus Nexus 7 portrait */@media screenand (device-width: 601px)and (device-height: 906px)and (-webkit-min-device-pixel-ratio: 1.331)and (-webkit-max-device-pixel-ratio: 1.332)and (orientation: portrait) { }/** * Asus Nexus 7 landscape */@media screenand (device-width: 601px)and (device-height: 906px)and (-webkit-min-device-pixel-ratio: 1.331)and (-webkit-max-device-pixel-ratio: 1.332)and (orientation: landscape) { }/** * Kindle Fire HD 7" landscape & portrait */@media only screenand (min-device-width: 800px)and (max-device-width: 1280px)and (-webkit-min-device-pixel-ratio: 1.5) { }/** * Kindle Fire HD 7" portrait */@media only screenand (min-device-width: 800px)and (max-device-width: 1280px)and (-webkit-min-device-pixel-ratio: 1.5)and (orientation: portrait) {}/** * Kindle Fire HD 7" landscape */@media only screenand (min-device-width: 800px)and (max-device-width: 1280px)and (-webkit-min-device-pixel-ratio: 1.5)and (orientation: landscape) { }/** * Kindle Fire HD 8.9" landscape & portrait */@media only screenand (min-device-width: 1200px)and (max-device-width: 1600px)and (-webkit-min-device-pixel-ratio: 1.5) { }/** * Kindle Fire HD 8.9" portrait */@media only screenand (min-device-width: 1200px)and (max-device-width: 1600px)and (-webkit-min-device-pixel-ratio: 1.5)and (orientation: portrait) {}/** * Kindle Fire HD 8.9" landscape */@media only screenand (min-device-width: 1200px)and (max-device-width: 1600px)and (-webkit-min-device-pixel-ratio: 1.5)and (orientation: landscape) { }/** * Non-Retina Screens */@media screenand (min-device-width: 1200px)and (max-device-width: 1600px)and (-webkit-min-device-pixel-ratio: 1) {}/** * Retina Screens */@media screenand (min-device-width: 1200px)and (max-device-width: 1600px)and (-webkit-min-device-pixel-ratio: 2)and (min-resolution: 192dpi) {}/** * Apple Watch */@media(max-device-width: 42mm)and (min-device-width: 38mm) { }/** * Moto 360 Watch */@media(max-device-width: 218px)and (max-device-height: 281px) { }

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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HTMLtagsareessentialforwebdevelopmentastheystructureandenhancewebpages.1)Theydefinelayout,semantics,andinteractivity.2)SemantictagsimproveaccessibilityandSEO.3)Properuseoftagscanoptimizeperformanceandensurecross-browsercompatibility.


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