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Technical Articles

Web Front-end

H5 Tutorial

How does the HTML5 parser handle errors?

HTML5parsershandlemalformedHTMLbyfollowingadeterministicalgorithmtoensureconsistentandrobustrendering.1.Formismatchedorunclosedtags,theparserautomaticallyclosestagsandadjustsnestingbasedoncontext,suchasclosingabeforeaandreopeningitafterward.2.Withimp

Aug 02, 2025 am 07:51 AM

html5 Error handling

How do you use the details and summary elements in HTML5?

Theandelementsworktogethertocreateacollapsiblesectionwheretheactsasaclickabletoggleandthecontentinsideishiddenbydefault.2.Clickingtherevealsthehiddencontent,andaddingtheopenattributemakesitvisibleinitially.3.Theseelementsarenativelysupportedinmodernb

Aug 02, 2025 am 07:20 AM

How to handle mouse events on an HTML5 canvas?

To correctly handle mouse events on HTML5 canvas, first add an event listener to canvas, then calculate the coordinates of the mouse relative to canvas, then judge whether it interacts with the drawn object through geometric detection, and finally realize interactive modes such as drag and drop. 1. Use addEventListener to bind mousedown, mousemove, mouseup and mouseleave events for canvas; 2. Use getBoundingClientRect method to convert clientX/clientY to coordinates relative to canvas; 3. Detect mouse through manual geometric calculations (such as the distance formula of rectangle boundary or circle)

Aug 02, 2025 am 06:29 AM

What is the role of the aria attributes in HTML5?

ARIAattributesenhancewebaccessibilitybyprovidingadditionalcontexttoassistivetechnologiesaboutanelement’spurpose,state,andbehavior.1.Theyareessentialfordynamiccontent,suchasmodaldialogsandcollapsiblemenus,ensuringscreenreadersdetectchanges.2.Commonatt

Aug 02, 2025 am 06:07 AM

What is the element used for in HTML5?

Theelementisusedtodefinemajornavigationlinksectionsonawebpage;1.Itisintendedforprimarysitenavigationsuchasmainmenus;2.Itcancontaintableofcontentslinkswithinlongarticles;3.Itissuitableforpaginationlinkslike“Next”or“Previous”;4.Itmayalsobeusedforbreadc

Aug 02, 2025 am 05:54 AM

Web Accessibility (a11y) Checklist: Building Inclusive H5 Applications

UsesemanticHTMLelementslike,,,andproperheadingstoconveystructure.2.Ensurefullkeyboardnavigationwithlogicaltaborder,visiblefocusindicators,andtrappedfocusinmodals.3.EnhancescreenreadercompatibilitywithARIAattributeslikearia-labelandaria-live,butavoido

Aug 02, 2025 am 05:46 AM

Understanding the Service Worker Lifecycle

Registration:Theserviceworkerlifecyclebeginswhenregister()iscalled,promptingthebrowsertodownloadandinstalltheworkerscriptifit’sneworchanged.2.Installation:Theinstalleventruns,allowingpre-cachingofcoreassetsviaevent.waitUntil();failurehereabortsinstal

Aug 02, 2025 am 05:43 AM

Demystifying JavaScript Closures and the Event Loop

Closuresallowinnerfunctionstoremembervariablesfromtheirouterscopeevenaftertheouterfunctionfinishes,enablingdataprivacyandfunctionfactories.2.TheeventloopisnotpartofJavaScriptbutoftheruntimeenvironment,coordinatingbetweenthecallstack,callbackqueue,and

Aug 02, 2025 am 04:41 AM

What is the difference between Web SQL Database and IndexedDB?

WebSQLDatabaseusesarelationalmodelwithSQL,whileIndexedDBusesaNoSQLkey-valuemodelwithJavaScriptobjects.2.WebSQLisdeprecatedwithlimitedbrowsersupport,whereasIndexedDBisafullysupportedW3Cstandardinallmodernbrowsers.3.WebSQLsuitsstructuredtabulardata,whi

Aug 02, 2025 am 02:07 AM

What are the different attributes of the HTML5 audio tag?

src specifies the audio file URL; 2.controls displays playback controls; 3.autoplay automatically plays after it is ready (must be muted or user interaction); 4.loop plays audio loop; 5.muted default muted; 6.preload controls preload behavior (none, metadata, auto); 7.controlsList experimental attributes, used to hide specific controls; it is recommended to use elements to provide multiple formats to enhance compatibility, and reasonably combine these attributes to optimize experience and performance to ensure cross-browser support.

Aug 02, 2025 am 02:05 AM

What is the role of the element in HTML5?

Theelementdefinestheprimarycontentofawebpageuniquetothedocument.2.Itenhancesaccessibilitybyhelpingscreenreadersidentifycorecontent.3.Itshouldappearonlyonceperpage,unlessoneinstanceishidden.4.Itmustnotcontainrepeatedcontentlikeheaders,footers,ornaviga

Aug 02, 2025 am 02:04 AM

html5 main元素

What are microdata attributes in HTML5?

itemscope creates a project scope, identifying the data of a specific project in the element; 2.itemtype is used in conjunction with item scope to specify the vocabulary URL that defines the project and attributes, such as the type in schema.org; 3.itemprop defines the attributes of the project, marking such as name, price, etc.; 4.itemid provides a unique identifier for the project, usually a URL; 5.itemref allows attributes outside the scope to be associated with the project, referring to other elements through id; using microdata can help search engines understand the content, improve the display effect of search results, and enhance SEO and user participation. Although JSON-LD is more popular, microda

Aug 02, 2025 am 01:50 AM

What is the purpose of the hidden attribute in HTML5?

ThehiddenattributeinHTML5isusedtosemanticallyhideelementsthatarenotcurrentlyrelevant.1.Itprovidesconditionalvisibility,keepingelementsintheDOMbuthiddenuntilneeded,suchassuccessmessagesafterformsubmission.2.Itimprovesaccessibilitybyensuringscreenreade

Aug 01, 2025 am 07:30 AM

The Role of Babel in Modern JavaScript Development

BabelisstilloftennecessaryinmodernJavaScriptdevelopmentbecauseittransformsnext-generationJavaScriptintobackward-compatiblecode,enablingdeveloperstousemodernfeatureslikeasync/awaitandexperimentalsyntaxsuchasdecorators,1)itconvertsmodernJavaScript(e.g.

Aug 01, 2025 am 07:28 AM