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Technical Articles

Web Front-end

H5 Tutorial

How do you properly structure a document with HTML5 semantic elements?

Using HTML5 semantic tags can improve accessibility, SEO and code readability; 2. Use,,,,,, and other tags correctly to define the page structure; 3. Avoid abuse of, ensure uniqueness, and use it for independent content and related auxiliary content; 4. The logical level that the title should follow, usually one per page, and use it or wrap the topic-related content; 5. The semantic structure should be as clear, orderly and hierarchical as the document outline, so as to help browsers and developers accurately understand the page content.

Aug 03, 2025 am 12:01 AM

What is the role of the novalidate attribute in HTML5 forms?

Thenovalidateattributedisablesthebrowser'sdefaultformvalidation,allowingsubmissionevenwithinvalidoremptyfields.2.ItisusefulforimplementingcustomJavaScriptvalidation,handlingmulti-stepforms,andcreatingstylederrormessages.3.Theformnovalidateattributeon

Aug 02, 2025 pm 03:46 PM

HTML5 Form

What are the advantages of using SVG over image files in HTML5?

SVGisresolution-independentandscalable,ensuringsharpvisualsonalldevicesandscreenresolutionswithoutpixelation.2.SVGoftenhassmallerfilesizesthanrasterformatsforsimplegraphics,leadingtofasterloadtimesandreducedbandwidth.3.SVGcanbestyledandanimatedusingC

Aug 02, 2025 pm 03:38 PM

html5 svg

What is the purpose of the and elements in HTML5?

Please make clear the HTML elements you are referring to, such as "and" or "and" so that I can accurately explain their use and differences in HTML5, otherwise there is no targeted answer.

Aug 02, 2025 pm 03:25 PM

How do you make an entire div clickable in HTML5?

Thebestwaytomakeanentiredivclickableistowrapitinantag,whichisvalidandsemanticinHTML5,ensuresaccessibility,supportsSEO,andrequiresnoJavaScript;2.Usestyleattributesliketext-decoration:noneandcolor:inheritonthetagtopreservedesignintegrity;3.AvoidtheJava

Aug 02, 2025 pm 03:13 PM

How do you handle errors with the HTML5 Geolocation API?

Alwaysincludeanerrorcallbackinnavigator.geolocation.getCurrentPosition()tohandlefailuresproperly;2.TheerrorCallbackreceivesaPositionErrorobjectwithcodeandmessagepropertiestoidentifytheissue;3.Handleerror.PERMISSION_DENIED(code1)bypromptingtheusertoen

Aug 02, 2025 pm 03:07 PM

What is the History API in HTML5?

TheHistoryAPIinHTML5enablesdynamicURLupdateswithoutpagereloads,allowingdeveloperstobuildseamlesssingle-pageapplications.1.history.pushState()addsanewhistoryentrywithaspecifiedstate,title,andURL.2.history.replaceState()updatesthecurrententrywithoutcre

Aug 02, 2025 pm 02:46 PM

What is the purpose of the and elements in HTML5?

HTML5elementsaredesignedtomakewebcontentmoresemanticallymeaningfulfordevelopers,browsers,searchengines,andassistivetechnologies.1.definesthetopsectionofapageorsection,typicallycontainingheadings,logos,ornavigation.2.representsasectionwithnavigationli

Aug 02, 2025 pm 02:26 PM

What is the difference between defer and async attributes for script tags in HTML5?

Bydefault,scriptsblockHTMLparsinguntildownloadedandexecuted.2.Asyncdownloadsscriptasynchronouslyandexecutesimmediatelyafterdownload,withoutguaranteedorder.3.DeferdownloadsasynchronouslybutexecutesonlyafterHTMLparsingcompletes,preservingscriptorder.4.

Aug 02, 2025 pm 02:11 PM

What are the key features of HTML5 Web Storage?

WebStorageofferslargercapacity(5-10MBperorigin)thancookies(4KB),enablingstorageofmoredatasuchasuserpreferencesorcachedcontent.2.Itprovidestwostorageoptions:localStorageforpersistentdatathatremainsafterbrowserrestarts,andsessionStoragefordatathatlasts

Aug 02, 2025 pm 01:45 PM

What is the WebRTC API in HTML5?

WebRTCisnotpartofHTML5butisakeywebtechnologygroupedwithit.1.Itenablesreal-timeaudio,video,anddatacommunicationdirectlyinbrowserswithoutplugins.2.KeyAPIsincludegetUserMedia()foraccessingcameraandmicrophone,RTCPeerConnectionformanagingpeerconnections,a

Aug 02, 2025 pm 01:40 PM

H5 Payment Handler API for Custom Payment Flows

PaymentHandlerAPI is part of the WebPayments standard, as an extension of PaymentRequestAPI, and its core role is to allow developers to register a "payment processor" to implement custom payment processes. It registers payment methods through ServiceWorker and combines the payment application manifest file under the .well-known directory to declare payment processor information. When used, the payment request is initiated through the PaymentRequest interface, the registered payment processor is called, and the complete() method is called after the payment is completed. Common precautions include: 1. Ensure HTTPS deployment; 2. Properly configure Service

Aug 02, 2025 pm 01:37 PM

api H5支付

How do you embed video and audio in an HTML5 document?

Use and tags to embed video and audio in HTML5 respectively; 2. To ensure compatibility, video should be provided with MP4 and WebM formats, and audio should be provided with MP3 and Ogg formats; 3. Add controls attributes to display playback controls, and use source tags to specify multiple source files; 4. Avoid unsilent automatic playback because it is often blocked by the browser; 5. Add subtitles through the track tag to improve accessibility; 6. Provide alternate text in the tag to support older browsers; and ultimately achieve compatible playback across modern browsers.

Aug 02, 2025 pm 01:11 PM

How to show subtitles or captions with an HTML5 video?

To add subtitles or descriptions to HTML5 videos, elements need to be used. 1. Add in the tag, set kind, src, src, srclang, label and optional default attributes; 2. Prepare a text file that conforms to WebVTT format, including timestamps and corresponding text, and save it with .vtt as the extension; 3. Associate the elements with WebVTT files, such as adding English instructions and Spanish subtitles; 4. The user will see the subtitle button in the supported browser, and can select the language. The track with the default attribute will automatically play, and ultimately realize multilingual subtitles support and improve accessibility.

Aug 02, 2025 pm 12:59 PM

subtitle HTML5 video