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HTML, or HyperText Markup Language, is a foundational element of the internet[2] as we know it today. It was proposed by Tim Berners-Lee in the 1980s, and has since undergone numerous revisions and updates. HTML is used to structure content on the web, from the text we read to the multimedia we consume. Various versions of HTML, such as HTML 2.0, HTML 3.2, and HTML 4.0, have been published over the years, each refining and expanding upon the capabilities of the previous versions. The most recent iteration, HTML5, was standardized in 2014 and includes a wealth of new features like video and audio support, local storage capabilities, and new semantic elements. HTML is also crucial for SEO (Search Engine Optimization[1]) and accessibility.

Definições de termos
1. Search engine optimization ( Search Engine Optimization ) Search engine optimization, commonly referred to as SEO, is a critical digital marketing strategy. Originating in the mid-90s, SEO involves enhancing websites to achieve higher rankings on search engine results pages. This process is essential for increasing web traffic and converting visitors into customers. SEO employs various techniques, including page design, keyword optimization, and content updates, to enhance a website's visibility. It also involves the use of tools for monitoring and adapting to search engine updates. SEO practices range from ethical 'white hat' methods to the disapproved 'black hat' techniques, with 'grey hat' straddling both. While SEO isn't suitable for all websites, its effectiveness in internet marketing campaigns cannot be underestimated. Recent industry trends such as mobile web usage surpassing desktop usage highlight the evolving landscape of SEO.
2. internet. A Internet é um sistema global de redes informáticas interligadas que utilizam protocolos de comunicação normalizados, principalmente o TCP/IP, para ligar dispositivos em todo o mundo. Com origem no termo "internetted" utilizado em 1849, o termo "Internet" foi mais tarde utilizado pelo Departamento de Guerra dos EUA em 1945. O seu desenvolvimento começou com cientistas informáticos que criaram sistemas de partilha de tempo na década de 1960 e progrediu com a criação da ARPANET em 1969. A Internet é autónoma, sem uma autoridade central, e os seus principais espaços de nomes são administrados pela Internet Corporation for Assigned Names and Numbers (ICANN). Transformou significativamente os meios de comunicação tradicionais e tem crescido exponencialmente ao longo dos anos, com os utilizadores da Internet a aumentarem anualmente de 20% para 50%. Em 2019, mais de metade da população mundial utilizou a Internet. O conjunto de protocolos da Internet, que inclui o TCP/IP e quatro camadas conceptuais, orienta os pacotes da Internet para os seus destinos. Serviços essenciais como o correio eletrónico e a telefonia via Internet funcionam na Internet. A World Wide Web, uma coleção global de documentos interligados, é uma componente essencial da Internet.
HTML (Wikipédia)

HyperText Markup Language ou HTML is the standard markup language for documents designed to be displayed in a web browser. It defines the content and structure of web content. It is often assisted by technologies such as Cascading Style Sheets (CSS) and scripting languages such as JavaScript.

(HyperText Markup Language)
The official logo of the latest version, HTML5
Filename extension
  • .html
  • .htm
Internet media type
Type codeTEXT
Uniform Type Identifier (UTI)public.html
Developed by
Lançamento inicial1993; 31 years ago (1993)
Latest release
Type of formatDocument file format
Container forHTML elements
Contained byWeb browser
Extended fromSGML
Extended toXHTML
Open format?Yes

Web browsers receive HTML documents from a web server or from local storage and render the documents into multimedia web pages. HTML describes the structure of a web page semantically and originally included cues for its appearance.

HTML elements are the building blocks of HTML pages. With HTML constructs, images and other objects such as interactive forms may be embedded into the rendered page. HTML provides a means to create structured documents by denoting structural semantics for text such as headings, paragraphs, lists, links, quotes, and other items. HTML elements are delineated by tags, written using angle brackets. Tags such as <img> e <input> directly introduce content into the page. Other tags such as <p> e </p> surround and provide information about document text and may include sub-element tags. Browsers do not display the HTML tags but use them to interpret the content of the page.

HTML can embed programs written in a scripting language such as JavaScript, which affects the behavior and content of web pages. The inclusion of CSS defines the look and layout of content. The World Wide Web Consortium (W3C), former maintainer of the HTML and current maintainer of the CSS standards, has encouraged the use of CSS over explicit presentational HTML since 1997. A form of HTML, known as HTML5, is used to display video and audio, primarily using the <canvas> element, together with JavaScript.

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