Web Front-end Programming Tutorials: Learn Web Front-end Online-php.cn

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Technical Articles

Web Front-end

How to animate element width or height in CSS?

Use transition to achieve CSS width and height smooth animation, suitable for interactive effects; avoid using auto when animate height, and can be replaced by max-height; @keyframes can be used for complex animations; it is recommended to use transform:scale() instead of width and height changes in performance-sensitive scenarios.

Sep 14, 2025 am 02:37 AM

What are the best practices for html accessibility?

UsesemanticHTMLelementslike,,todefinestructureandimprovecontextforassistivetechnologies.2.Providetextalternativeswithdescriptivealtattributesforimages,transcriptsforaudio,andcaptionsforvideo.3.Ensurekeyboardaccessibilitybyenablingtabnavigation,visibl

Sep 14, 2025 am 02:21 AM

html

How to style a radio button with CSS

To customize the radio button style, you need to hide the native buttons and create a custom appearance with CSS: 1. Use opacity: 0 and position:absolute to hide the default input box; 2. Use span::before pseudo-element to draw custom circular buttons; 3. Use input:checked span::after to display the inner circle of the selected state; 4. Add:hover and:focus states to improve interaction and accessibility; it is recommended to use the modern appearance:none method to simplify the structure, while ensuring that the label tag is retained, keyboard navigation is supported, and focus indicators are maintained to ensure availability and barrier-free access.

Sep 14, 2025 am 02:16 AM

How to use the :nth-child() selector in CSS

:nth-child() is a powerful selector in CSS for selecting elements based on the position of the element in the parent container. 1. Its basic syntax is: nth-child(an b), where a is the period interval, n is the counter, and b is the offset; 2. Common uses include: nth-child(3), :nth-child(odd) and :nth-child(even) to select odd and even positions elements respectively, which are equivalent to: nth-child(2n 1) and :nth-child(2n); 3. Use formulas such as 3n 1 to select 1st, 4th, 7th... elements, 4n 2 to select 2nd, 6th, 10th... elements; 4. Practical applications include table spots

Sep 14, 2025 am 02:14 AM

Implementing global status updates with React Context: Boss HP Sample Tutorial

This article aims to resolve the issue where React Context cannot be updated in TypeScript projects. With a Boss HP example, we will explain in detail how to properly create, provide, and consume Contexts, and how to ensure that state is successfully shared and updated among components. We will provide runnable code examples and explain key steps to help developers avoid common Context usage traps and enable reliable global state management.

Sep 14, 2025 am 02:12 AM

How to build an offline-first application with HTML5?

Buildoffline-firstHTML5appsusingserviceworkerstocacheassetsandinterceptnetworkrequests.2.UsetheCacheAPIforstaticresourcesandIndexedDBforstructureduserdata.3.ImplementBackgroundSynctodeferactionsuntilconnectivityisrestored.4.DesignUXtoreflectofflinest

Sep 14, 2025 am 02:09 AM

How to create a responsive dashboard in Bootstrap

Using Bootstrap5 to build a responsive dashboard, you must first build an HTML5 structure and introduce CSS and JS; 2. Create a full-width layout through container-fluid and row, combine col-md-3 and col-lg-2 to realize responsive sidebars. The main content area uses col-md-9 and col-lg-10 to adapt width, and the mobile terminal can use offcanvas components to hide the sidebar; 3. Use card grids (col-12, col-sm-6, col-lg-4) to realize the adaptive arrangement of data cards under different screens, and use table-responsive classes to ensure that the table can be scrolled horizontally on the small screen; 4. Use spacing tools, m

Sep 14, 2025 am 01:59 AM

How to create and use custom filters in Vue 2 (and their equivalent in Vue 3)?

Vue3removedcustomfilters;usemethods,computedproperties,orcomposablesinstead.1.InVue2,filtersweredefinedlocallyinthefiltersoptionorgloballyviaVue.filter()andusedintemplateswiththepipesyntax(e.g.,{{message|capitalize}}).2.InVue3,replacefilterswithmetho

Sep 14, 2025 am 01:50 AM

Vue 3 Vue 2

How to add a border to an html table?

ToaddabordertoanHTMLtable,useCSS:applybordertotable,th,andtdelements,andsetborder-collapse:collapseforsingle,cleanlinesbetweencells.

Sep 14, 2025 am 01:39 AM

frame html table

How to add a description meta tag in html for SEO?

ThemetadescriptioniscrucialforSEOasitinfluencesclick-throughratesbysummarizingpagecontentinsearchresults.Itshouldbeunique,concise(150–160characters),andaccuratelyreflectthepage’scontentwhilenaturallyincludingkeywords.Forexample,abakerymightuse:"

Sep 14, 2025 am 01:28 AM

html seo

How to create a responsive font size in CSS

ThebestwaytocreateresponsivefontsizesinCSSisusingtheclamp()function,whichenablesfluidtypographybysettingaminimum,preferred,andmaximumfontsize;forexample,font-size:clamp(1.5rem,2.5vw 1rem,3rem)ensurestextscalessmoothlybetween1.5remand3rembasedonviewpo

Sep 14, 2025 am 01:24 AM

css 响应式字体