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Introduzione all'XHTML

Introduzione all'XHTML

XHTML o Linguaggio di markup ipertestuale estensibile è un mix di HTML e XML, molto simile a HTML ma più severo. È come un libro di regole per la creazione di pagine Web facilmente comprensibili dai browser. A differenza dell'HTML, devi stare attento e seguire esattamente le regole. La maggior parte dei browser lo supporta. Pensalo come un modo più preciso per scrivere codice web.

Tabella dei contenuti

Storia

È stato sviluppato dal World Wide Web Consortium (W3C) e aiuta gli sviluppatori web a passare da HTML a XML. Con XHTML, gli sviluppatori possono entrare nel mondo XML con tutte le sue funzionalità garantendo comunque la compatibilità con le versioni precedenti e future del contenuto. La famiglia XHTML comprende tre tipi di documenti; il primo è XHTML 1.0, raccomandato dal W3C il 26 gennaio 2000. Il secondo è XHTML 1.1, raccomandato dal W3C il 31 maggio 2001.

Il terzo è XHTML5, uno standard utilizzato per sviluppare un adattamento XML delle specifiche HTML5. Un documento XHTML deve avere una dichiarazione XHTML.

Elementi di XHTML:

Elemento XHTML Descrizione
> Utilizzato per dichiarare la Document Type Definition (DTD), specificando le regole per il linguaggio di markup, garantendo il corretto rendering nei browser.
> Racchiude l'intero documento HTML o XHTML, fungendo da elemento radice.
> Contiene metainformazioni sul documento, come titolo, set di caratteri, fogli di stile collegati e altri elementi essenziali.
> Nidificato all'interno della sezione head, specifica il titolo del documento, visualizzato nella barra o nella scheda del titolo del browser.
> Racchiude il contenuto della pagina Web, inclusi testo, immagini, collegamenti e altri elementi HTML. Rappresenta la parte visibile del documento visualizzato nel browser.

Quando si crea una pagina web XHTML, è necessario includere una dichiarazione DTD (Document Type Definition). Esistono tre tipi di DTD discussi di seguito:

DTD transitorio:

È supportato dai browser più vecchi che non dispongono di supporti integrati per i fogli di stile a cascata. Nel tag body sono racchiusi diversi attributi che non sono consentiti nella DTD rigorosa.

Sintassi: 

 PUBLIC '-//W3C//DTD XHTML 1.0 Transitional//EN' 'DTD/xhtml1-transitional.dtd'>

Esempio: In questo esempio vedremo il codice per scrivere un documento XHTML con un esempio.

html




xml version='1.0' encoding='UTF-8'?> Titolo XHTML DTD transitorio> head> <body bgcolor='#dae1ed'> <div>peso carattere: grassetto; allineamento testo: centro; margin-bottom:-25px;'>techcodeview.comdiv> <p style='text-align:center;font-size:20px;'>Un portale informatico> <p style='text-align:center;font-size:20px;'>Possibilità di scegliere il mese: <select name='month'> <option selected='selected'>Opzione gennaio> <option>Opzione di febbraio> <option>Opzione marzo> <option>Opzione di aprile> <option>Opzione maggio> <option>Opzione giugno> <option>Opzione luglio> <option>Opzione agosto> <option>Opzione settembre> <option>Opzione ottobre> <option>Opzione di novembre> <option>Dicembreopzione> seleziona> p> corpo> html>> </code> </td> </tr> </tbody> </table> <p> </p> <i id='output-icon' title='Output'> </i> <p> </p> <p> </p> <i id='copy-url-button' title='Copy Generated Ide URL'> </i> <p> </p> <p> </p> <p dir='ltr'> <b> <strong>Produzione: </strong> </b> </p> <p> <img src='//techcodeview.com/img/html-xml/79/xhtml-introduction.webp' alt='dtd transitorio xhtml'> <span> </span> </p> <h2 id='strict-dtd'> <b> <strong>DTD rigoroso: </strong> </b> <span> </span> </h2> <p dir='ltr'> <span>La DTD rigorosa viene utilizzata quando la pagina XHTML contiene solo linguaggio di markup. La DTD rigorosa viene utilizzata insieme ai fogli di stile a cascata, poiché questo attributo non consente la proprietà CSS nel tag body. </span> </p> <h3> <b> <strong>Sintassi: </strong> </b> </h3> <pre> PUBLIC '-//W3C//DTD XHTML 1.0 Strict//EN' 'DTD/xhtml1-strict.dtd'> </pre> <p dir='ltr'> <b> <strong>Esempio 2: </strong> </b> <span>In questo esempio vedremo il codice per scrivere un documento XHTML con un esempio per la DTD rigorosa. </span> </p> <h2>html </h2> <i id='copy-code-button' title='Copy Code'> </i> <p> </p> <p> <i id='run-and-edit-button' title='Edit Code' lang='xml'> </i> <br> </p> <p> <i id='run-code-button' lang='xml' title='Run Code and See Output'> </i> </p> <p> <i id='generate-url-and-run-button' title='Run Code and Generate IDE URL' lang='xml'> </i> <br> <i title='Dark Mode'> </i> <br> <i id='edit-on-ide-button' title='Edit on IDE' lang='xml'> </i> </p> <p> </p> <table class="table"> <tbody> <tr> <td> <code>xml version='1.0' encoding='UTF-8'?> <html xmlns=' http://www.w3.org/1999/xhtml ' xml:lang='en' lang='en'> <head> <title>Titolo XHTML DTD rigoroso> head> <body> <div>peso carattere: grassetto; allineamento testo: centro; margin-bottom:-25px;'>techcodeview.comdiv> <p style='text-align:center;font-size:20px;'>Un portale informatico> <p style='text-align:center;font-size:20px;'>Possibilità di scegliere il mese: <select name='month'> <option selected='selected'>Opzione gennaio> <option>Opzione di febbraio> <option>Opzione marzo> <option>Opzione di aprile> <option>Opzione maggio> <option>Opzione giugno> <option>Opzione luglio> <option>Opzione agosto> <option>Opzione settembre> <option>Opzione ottobre> <option>Opzione di novembre> <option>Dicembreopzione> seleziona> p> corpo> html>> </code> </td> </tr> </tbody> </table> <p> </p> <i id='output-icon' title='Output'> </i> <p> </p> <p> </p> <i id='copy-url-button' title='Copy Generated Ide URL'> </i> <p> </p> <p> </p> <p dir='ltr'> <b> <strong>Produzione: </strong> </b> </p> <p> <span> </span> <img src='//techcodeview.com/img/html-xml/79/xhtml-introduction-2.webp' alt='rigoroso dtd xhtml'> <span> </span> </p> <h2 id='frameset-dtd'> <b> <strong>DTD del telaio: </strong> </b> <span> </span> </h2> <p dir='ltr'> <span>Il DTD frameset viene utilizzato quando la pagina XHTML contiene frame. Questo DTD è identico al DTD transitorio di HTML 4.01 ad eccezione del modello di contenuto dell'elemento HTML. </span> </p> <h3> <b> <strong>Sintassi: </strong> </b> </h3> <pre> PUBLIC '-//W3C//DTD XHTML 1.0 Frameset//EN' 'DTD/xhtml1-frameset.dtd'> </pre> <p dir='ltr'> <b> <strong>Esempio 2: </strong> </b> <span>In questo esempio vedremo il codice per scrivere un documento XHTML con un esempio per frameset DTD. </span> </p> <h2>html </h2> <i id='copy-code-button' title='Copy Code'> </i> <p> </p> <p> <i id='run-and-edit-button' title='Edit Code' lang='xml'> </i> <br> </p> <p> <i id='run-code-button' lang='xml' title='Run Code and See Output'> </i> </p> <p> <i id='generate-url-and-run-button' title='Run Code and Generate IDE URL' lang='xml'> </i> <br> <i title='Dark Mode'> </i> <br> <i id='edit-on-ide-button' title='Edit on IDE' lang='xml'> </i> </p> <p> </p> <table class="table"> <tbody> <tr> <td> <code>xml version='1.0' encoding='UTF-8'?>http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd '> <html xmlns=' http://www.w3.org/1999/xhtml ' xml:lang='en' lang='en'> <head> <title>Frameset DTD XHTMLtitle> head> <frameset cols='30%, 20%, *'> <frameset rows='40%, 30%, *'> <frame src='gfg.html' /> <frame src='gfg1.html' /> <frame src='geeks.html' />telaio> <frameset rows='40%, 60%'> <frame src='g4g.html' /> <frame src='g4g1.html' />telaio> <frameset rows='20%, 20%, 30%, *'> <frame src='geeksforgeeks.html' /> <frame src='geeksforgeeks1.html' /> <frame src='geeksforgeeks2.html' /> <frame src='geeksforgeeks3.html' />set di frame>set di frame>html>> </code> </td> </tr> </tbody> </table> <p> </p> <i id='output-icon' title='Output'> </i> <p> </p> <p> </p> <i id='copy-url-button' title='Copy Generated Ide URL'> </i> <p> </p> <p> </p> <p dir='ltr'> <b> <strong>Produzione: </strong> </b> </p> <h2 id='why-use-xhtml'> <img src='//techcodeview.com/img/html-xml/79/xhtml-introduction-3.webp' alt='set di frame dtd xhtml'> <b> <strong>Perché usare XHTML? </strong> </b> </h2> <ul> <li value='1'> <span>I documenti XHTML vengono convalidati con strumenti XML standard. </span> </li> <li value='2'> <span>È facile mantenere, convertire e modificare i documenti a lungo termine. </span> </li> <li value='3'> <span>Viene utilizzato per definire lo standard di qualità delle pagine web. </span> </li> <li value='4'> <span>XHTML è uno standard ufficiale del W3C, il tuo sito web diventa più compatibile e accurato con molti browser. </span> </li> </ul> <h2 id='benefits-of-xhtml'> <b> <strong>Vantaggi dell'XHTML: </strong> </b> </h2> <ul> <li value='1'> <span>Tutti i tag XHTML devono avere tag di chiusura e essere nidificati correttamente. Questo genera un codice più pulito. </span> </li> <li value='2'> <span>I documenti XHTML sono snelli, il che significa che utilizzano meno larghezza di banda. Ciò riduce i costi soprattutto se il tuo sito web ha migliaia di pagine. </span> </li> <li value='3'> <span>I documenti XHTML sono ben formattati e possono essere facilmente trasportati su dispositivi wireless, lettori Braille e altri ambienti web specializzati. </span> </li> <li value='4'> <span>Tutti i nuovi sviluppi saranno in XML (di cui XHTML è un'applicazione). </span> </li> <li value='5'> <span>XHTML funziona in associazione con CSS per creare pagine Web che possono essere facilmente aggiornate. </span> </li> </ul> <h2 id='difference-between-html-and-xhtml'> <b> <strong>Differenza tra HTML e XHTML: </strong> </b> </h2> <table class="table"> <tbody> <tr> <th> <span>HTML </span> </th> <th> <span>XHTML </span> </th> </tr> </tbody> <tbody> <tr> <td> <span>HTML o HyperText Markup Language è il principale linguaggio di markup per la creazione di pagine web </span> </td> <td> <span>XHTML (Extensible HyperText Markup Language) è una famiglia di linguaggi di markup XML che rispecchiano o estendono le versioni dell'Hypertext Markup Language (HTML) ampiamente utilizzato. </span> </td> </tr> <tr> <td> <span>Framework flessibile che richiede un parser specifico HTML indulgente </span> </td> <td> <span>Sottoinsieme restrittivo di XML che deve essere analizzato con parser XML standard </span> </td> </tr> <tr> <td> <span>Proposto da Tim Berners-Lee nel 1987 </span> </td> <td> <span>Raccomandazione del World Wide Web Consortium nel 2000. </span> </td> </tr> <tr> <td> <span>Applicazione del linguaggio di markup generalizzato standard (SGML). </span> </td> <td> <span>Applicazione dell'XML </span> </td> </tr> <tr> <td> <span>Esteso da SGML. </span> </td> <td> <span>Esteso da XML, HTML </span> </td> </tr> </tbody> </table> <br> <br> </div> <!-- Article Footer with Prominent Share Buttons --> <div class="px-6 md:px-8 py-8 bg-slate-50 dark:bg-slate-900/50 border-t border-slate-200 dark:border-slate-700/50"> <div class="flex flex-col sm:flex-row items-center justify-between gap-6"> <h4 class="text-base font-bold text-slate-700 dark:text-slate-300 uppercase tracking-wide flex items-center gap-2"> <i class="fa fa-share-alt text-tech-500"> </i> Condividere </h4> <div class="flex flex-wrap justify-center gap-3"> <!-- Twitter --> <a href="https://twitter.com/intent/tweet?text=Introduzione all'XHTML&url=https://www.techcodeview.com/it/xhtml-introduction" target="_blank" rel="noopener noreferrer" class="flex items-center gap-2 px-6 py-3 rounded-xl bg-[#1DA1F2]/10 text-[#1DA1F2] hover:bg-[#1DA1F2] hover:text-white transition-all duration-300 font-bold text-sm"> <i class="fa fa-twitter text-lg"> </i> <span class="hidden sm:inline">Twitter </span> </a> <!-- Facebook --> <a href="https://www.facebook.com/sharer/sharer.php?u=https://www.techcodeview.com/it/xhtml-introduction" target="_blank" rel="noopener noreferrer" class="flex items-center gap-2 px-6 py-3 rounded-xl bg-[#4267B2]/10 text-[#4267B2] hover:bg-[#4267B2] hover:text-white transition-all duration-300 font-bold text-sm"> <i class="fa fa-facebook text-lg"> </i> <span class="hidden sm:inline">Facebook </span> </a> <!-- LinkedIn --> <a href="https://www.linkedin.com/shareArticle?mini=true&url=https://www.techcodeview.com/it/xhtml-introduction&title=Introduzione all'XHTML" target="_blank" rel="noopener noreferrer" class="flex items-center gap-2 px-6 py-3 rounded-xl bg-[#0077b5]/10 text-[#0077b5] hover:bg-[#0077b5] hover:text-white transition-all duration-300 font-bold text-sm"> <i class="fa fa-linkedin text-lg"> </i> <span class="hidden sm:inline">LinkedIn </span> </a> </div> </div> </div> </article> <!-- Comments Placeholder / Random Articles --> <div class="mt-8 bg-white dark:bg-slate-800 border border-slate-200 dark:border-slate-700 rounded-xl p-6 md:p-8 shadow-sm"> <h3 class="text-xl font-bold text-slate-900 dark:text-white mb-6 uppercase tracking-wide border-b border-slate-200 dark:border-slate-700 pb-2"> Potrebbe Piacerti </h3> <div class="grid grid-cols-1 md:grid-cols-2 gap-6"> <div class="group"> <a href="/it/classloader-java" class="block aspect-video rounded-lg overflow-hidden bg-slate-200 dark:bg-slate-700 mb-3"> <img loading="lazy" src="https://techcodeview.com/img/java-misc/44/classloader-java.webp" onerror="this.onerror=null; 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