HTML Form Attribute
HTML provides very strong support to build web forms using built-in elements. Web forms are often the most used functionality at the client-side or user end. The HTML provides
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How to restrict file types for an upload input in HTML
Aug 24, 2025 am 02:57 AM
Use the accept attribute to limit the upload type of HTML file, such as accept="image/*" only allows images, accept=".pdf" only allows PDF, accept=".doc,.docx,.pdf,.txt" allows multiple specified types, and can combine JavaScript to verify file types to improve user experience, but security verification must be performed on the server side, because the accept attribute is not secure and the browser supports are different, and it is only used to improve availability rather than replace server verification.
How to disable a form element in HTML
Aug 30, 2025 am 08:45 AM
To disable HTML form elements, you can use the disabled attribute, which can prevent user interaction and the element value will not be submitted with the form. This attribute is of a Boolean type and can be directly added to form element tags such as input, textarea, select, or button. For example, it can also be dynamically controlled through JavaScript, such as document.getElementById("myInput").disabled=true. If the element cannot be edited but the value is still submitted, you should use the readonly attribute. The disabled attribute is simple and effective and widely supported.
How to use the HTML5 contenteditable attribute
Aug 23, 2025 am 09:55 AM
ThecontenteditableattributemakesHTMLelementseditablebyaddingcontenteditable="true"toelementslikediv,p,orh1–h6.2.UseJavaScripttoretrievecontentviainnerHTMLforformattedtextortextContentforplaintext.3.Listenforchangesusingtheinputeventtocaptur
How to add a favicon to your website with HTML5
Aug 27, 2025 am 02:35 AM
To add a website favicon correctly, first prepare a 32×32 or 64×64 pixel .ico, .png or .svg format icon file and name it favicon.ico, etc., place it in the website root directory or a specified path, and then use a clear statement in the HTML tag. For example: It is recommended to support multiple formats and devices at the same time, such as adding PNG different size versions, SVG icons, and Apple touch icons. Finally, clear the cache and test whether it displays normally, to ensure that the path is correct and the file is accessible. The entire process requires attention to the file format, path and compatibility to avoid loading failure.
What is the importance of the alt attribute for images in HTML5?
Aug 27, 2025 am 02:29 AM
Thealtattributeisessentialforaccessibility,SEO,anduserexperience;1.Itenablesscreenreaderstodescribeimagestovisuallyimpairedusers,ensuringcontentcomprehension;2.Itdisplaysfallbacktextwhenimagesfailtoload,maintainingcontext;3.ItimprovesSEObyhelpingsear
What is ARIA in HTML for accessibility?
Aug 27, 2025 am 04:57 AM
ARIAisneededtoenhancewebaccessibilityfordynamiccontentandcustomUIcomponentsthatlacknativeHTMLsemantics.1)ARIArolesdefineanelement’spurpose(e.g.,role="dialog").2)ARIApropertiesdescribecharacteristics(e.g.,aria-label,aria-describedby).3)ARIAs
What is the placeholder attribute's purpose in HTML5?
Aug 31, 2025 am 06:58 AM
Theplaceholderattributeprovidesashorthintininputfieldsthatdisappearswhentypingbegins;1.Itisusedinandelementstoshowexampletextlike"Enteryouremail";2.Thehintisdisplayedonlywhenthefieldisemptyandstyledfaintlybybrowsers;3.Itdoesnotreplacetheele
How does Content Security Policy (CSP) work with HTML5?
Aug 30, 2025 am 01:29 AM
CSPenhancesHTML5securitybydefiningtrustedcontentsourcestopreventXSS,clickjacking,andcodeinjection.1.Itrestrictsinlinescriptsandstylesbyblockingthemunless'unsafe-inline',nonces,orhashesareused.2.Itcontrolsexternalresourcesviadirectiveslikescript-src,i


