Neste capítulo vamos aprender como identificar e agrupar elementos, comentários, informações meta e iframes, isto é, aprender a identificar as diferentes versões do HTML e como para indicar que versão que estamos a usar, entre outros. Portanto, cada página da Web deve começar com uma declaração DOCTYPE, para também ajudar a renderizar uma página corretamente. Desta forma, irá ser mais fácil para o navegador ver qual versão do HTML da página está a ser utilizado.
Os comentários são importantes para aqueles que estão a visualizar o nosso código fonte. Não é útil
nem é possível visualizar os comentários do código para aqueles que estão a aceder ao nossa aplicação. Apenas será útil para quem te acesso ao nosso código.
Falando agora noutro assunto deste capítulo, agrupamento de texto e elementos em um bloco. Por exemplo, se criarmos um < div> elemento para conter todos os elementos para o cabeçalho do site, em um navegador o conteúdo do < div> elemento irá começar em uma nova linha, no entanto não vai fazer diferença para a página. Ao agrupar elementos de texto em um bloco irá facilitar na organização ou na futura alteração do código, sendo mais claro. Outro exemplo é o facto que poderá ser útil para adicionar um comentário após o encerramento do código.
Outro método existente idêntico ao div é o < span> elementos. Este é usado para controlar especialmente a aparência do conteúdo desses elementos. Outro elemento é o
Laboratório de Computação Gráfica e Ambientes Virtuais
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