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<!DOCTYPE html>
<html lang="pt-BR">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Tag <h3></title>
<link rel="stylesheet" href="utils/css/global.css">
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link
href="https://fonts.googleapis.com/css2?family=Roboto:wght@400;500;700&display=swap"
rel="stylesheet">
</head>
<body>
<header>
<nav>
<div class="logo">Tags HTML</div>
<ul class="nav-links">
<li><a href="index.html">Home</a></li>
<li><a href="referencias.html">Referências</a></li>
<li><a href="sobre.html">Sobre Nós</a></li>
</ul>
</nav>
</header>
<main>
<article class="main-content">
<section class="title-section">
<section class="title-section-tag">
<h1>Tag HTML <h3></h1>
</section>
<p class="subtitle">
A tag <code><h3></code> define **subtítulos de terceiro nível** dentro de um documento HTML.
Ela representa seções subordinadas a um título <code><h2></code> e ajuda a estruturar o conteúdo de forma hierárquica.
</p>
<section class="content">
<section class="example-section">
<h3>Exemplo</h3>
<p>Exemplo de uso da tag <code><h3></code> em um documento HTML:</p>
<div class="code-block">
<pre>
<!DOCTYPE html>
<html lang="pt-BR">
<head>
<meta charset="UTF-8">
<title>Exemplo da tag <h3></title>
</head>
<body>
<h1>Guia de Receitas</h1>
<h2>Bolos</h2>
<h3>Bolos de Chocolate</h3>
<p>Receitas de bolos de chocolate deliciosos.</p>
<h3>Bolos de Baunilha</h3>
<p>Receitas de bolos de baunilha fofinhos.</p>
</body>
</html>
</pre>
</div>
</section>
<section class="example-section">
<h3>Definição e uso</h3>
<p>
A tag <code><h3></code> define um **título de terceiro nível**, usado para criar subseções dentro de um <code><h2></code>.
Ela mantém a hierarquia semântica e auxilia na organização do conteúdo.
</p>
<p>
Essa estrutura de cabeçalhos (<code><h1></code> a <code><h6></code>) é importante para SEO, leitura de tela e clareza do conteúdo.
</p>
</section>
<section class="example-section">
<h3>Hierarquia de títulos</h3>
<p>Exemplo da hierarquia usando <code><h3></code>:</p>
<div class="code-block">
<pre>
<h1>Manual do Usuário</h1>
<h2>Instalação</h2>
<h3>Requisitos</h3>
<h3>Passo a passo</h3>
<h2>Configuração</h2>
<h3>Opções Avançadas</h3>
</pre>
</div>
</section>
<section class="example-section">
<h3>Boas práticas</h3>
<ul>
<li>Use <code><h3></code> para subtítulos de seções dentro de um <code><h2></code>.</li>
<li>Mantenha a hierarquia correta dos títulos, não pulando níveis.</li>
<li>Evite usar a tag apenas para aumentar o tamanho do texto — utilize CSS para estilização visual.</li>
<li>Assegure que cada <code><h3></code> descreve de forma clara o conteúdo da subseção.</li>
</ul>
</section>
<section class="example-section">
<h3>Características e atributos</h3>
<table class="attributes-table">
<thead>
<tr>
<th>Atributo</th>
<th>Descrição</th>
</tr>
</thead>
<tbody>
<tr>
<td>Atributos globais</td>
<td>Pode usar todos os atributos globais como <code>id</code>, <code>class</code>, <code>style</code>, etc.</td>
</tr>
<tr>
<td>Atributos específicos</td>
<td>Não possui atributos específicos.</td>
</tr>
<tr>
<td>Categoria de conteúdo</td>
<td>Fluxo e cabeçalho.</td>
</tr>
<tr>
<td>Tags relacionadas</td>
<td><code><h1></code>, <code><h2></code>, <code><h4></code>, <code><h5></code>, <code><h6></code>.</td>
</tr>
</tbody>
</table>
</section>
<section class="example-section">
<h3>Acessibilidade</h3>
<p>
A tag <code><h3></code> ajuda leitores de tela a navegar entre subseções de conteúdo.
Mantendo a sequência correta de cabeçalhos, o conteúdo se torna mais compreensível e acessível.
</p>
</section>
</section>
</section>
</article>
<aside class="sidebar">
<h2>Outras Tags HTML</h2>
<input type="text" id="searchInput" placeholder="Pesquisar tag..." class="btn search-box">
<ul class="sidebar-links" id="tagList">
<li><a href="canvas.html"><canvas></a></li>
<li><a href="fieldset.html"><fieldset></a></li>
<li><a href="legend.html"><legend></a></li>
<li><a href="picture.html"><picture></a></li>
<li><a href="sub.html"><sub></a></li>
<li><a href="var.html"><var></a></li>
<li><a href="base.html"><base></a></li>
<li><a href="dfn.html"><dfn></a></li>
<li><a href="i.html"><i></a></li>
<li><a href="object.html"><object></a></li>
<li><a href="section.html"><section></a></li>
<li><a href="thead.html"><thead></a></li>
<li><a href="a.html"><a></a></li>
<li><a href="code.html"><code></a></li>
<li><a href="footer.html"><footer></a></li>
<li><a href="main.html"><main></a></li>
<li><a href="q.html"><q></a></li>
<li><a href="svg.html"><svg></a></li>
<li><a href="audio.html"><audio></a></li>
<li><a href="del.html"><del></a></li>
<li><a href="hr.html"><hr></a></li>
<li><a href="nav.html"><nav></a></li>
<li><a href="script.html"><script></a></li>
<li><a href="tfoot.html"><tfoot></a></li>
<li><a href="article.html"><article></a></li>
<li><a href="datalist.html"><datalist></a></li>
<li><a href="header.html"><header></a></li>
<li><a href="meta.html"><meta></a></li>
<li><a href="s.html"><s></a></li>
<li><a href="template.html"><template></a></li>
<li><a href="body.html"><body></a></li>
<li><a href="dt.html"><dt></a></li>
<li><a href="ins.html"><ins></a></li>
<li><a href="output.html"><output></a></li>
<li><a href="span.html"><span></a></li>
<li><a href="track.html"><track></a></li>
<li><a href="abbr.html"><abbr></a></li>
<li><a href="col.html"><col></a></li>
<li><a href="form.html"><form></a></li>
<li><a href="map.html"><map></a></li>
<li><a href="rp.html"><rp></a></li>
<li><a href="table.html"><table></a></li>
<li><a href="doctype.html"><!DOCTYPE></a></li>
<li><a href="cite.html"><cite></a></li>
<li><a href="figure.html"><figure></a></li>
<li><a href="link.html"><link></a></li>
<li><a href="progress.html"><progress></a></li>
<li><a href="sup.html"><sup></a></li>
<li><a href="wbr.html"><wbr></a></li>
<li><a href="area.html"><area></a></li>
<li><a href="data.html"><data></a></li>
<li><a href="head.html"><head></a></li>
<li><a href="menu.html"><menu></a></li>
<li><a href="ruby.html"><ruby></a></li>
<li><a href="td.html"><td></a></li>
<li><a href="button.html"><button></a></li>
<li><a href="embed.html"><embed></a></li>
<li><a href="label.html"><label></a></li>
<li><a href="param.html"><param></a></li>
<li><a href="style.html"><style></a></li>
<li><a href="ul.html"><ul></a></li>
<li><a href="br.html"><br></a></li>
<li><a href="em.html"><em></a></li>
<li><a href="kbd.html"><kbd></a></li>
<li><a href="p.html"><p></a></li>
<li><a href="strong.html"><strong></a></li>
<li><a href="u.html"><u></a></li>
<li><a href="blockquote.html"><blockquote></a></li>
<li><a href="dl.html"><dl></a></li>
<li><a href="input.html"><input></a></li>
<li><a href="option.html"><option></a></li>
<li><a href="source.html"><source></a></li>
<li><a href="tr.html"><tr></a></li>
<li><a href="bdi.html"><bdi></a></li>
<li><a href="dialog.html"><dialog></a></li>
<li><a href="iframe.html"><iframe></a></li>
<li><a href="ol.html"><ol></a></li>
<li><a href="select.html"><select></a></li>
<li><a href="time.html"><time></a></li>
<li><a href="bdo.html"><bdo></a></li>
<li><a href="div.html"><div></a></li>
<li><a href="img.html"><img></a></li>
<li><a href="optgroup.html"><optgroup></a></li>
<li><a href="small.html"><small></a></li>
<li><a href="title.html"><title></a></li>
<li><a href="b.html"><b></a></li>
<li><a href="details.html"><details></a></li>
<li><a href="html.html"><html></a></li>
<li><a href="noscript.html"><noscript></a></li>
<li><a href="search.html"><search></a></li>
<li><a href="th.html"><th></a></li>
<li><a href="aside.html"><aside></a></li>
<li><a href="dd.html"><dd></a></li>
<li><a href="hgroup.html"><hgroup></a></li>
<li><a href="meter.html"><meter></a></li>
<li><a href="samp.html"><samp></a></li>
<li><a href="textarea.html"><textarea></a></li>
<li><a href="address.html"><address></a></li>
<li><a href="colgroup.html"><colgroup></a></li>
<li><a href="h1.html"><h1></a></li>
<li><a href="h2.html"><h2></a></li>
<li><a href="h3.html"><h3></a></li>
<li><a href="h4.html"><h4></a></li>
<li><a href="h5.html"><h5></a></li>
<li><a href="h6.html"><h6></a></li>
<li><a href="mark.html"><mark></a></li>
<li><a href="rt.html"><rt></a></li>
<li><a href="tbody.html"><tbody></a></li>
<li><a href="comment.html"><!--...--></a></li>
<li><a href="caption.html"><caption></a></li>
<li><a href="figcaption.html"><figcaption></a></li>
<li><a href="li.html"><li></a></li>
<li><a href="pre.html"><pre></a></li>
<li><a href="summary.html"><summary></a></li>
<li><a href="video.html"><video></a></li>
</ul>
</aside>
</main>
<footer>
<p>Copyright © 2025 Tutorial HTML5</p>
<p>
<a href="index.html">Home</a> |
<a href="sobre.html">Sobre Nós</a> |
<a href="referencias.html">Referências</a>
</p>
</footer>
</body>
</html>
<script>
const searchInput = document.getElementById('searchInput');
const tagList = document.getElementById('tagList');
const items = tagList.getElementsByTagName('li');
searchInput.addEventListener('keyup', function () {
const filter = this.value.toLowerCase();
for (let i = 0; i < items.length; i++) {
const link = items[i].getElementsByTagName('a')[0];
const text = link.textContent.toLowerCase();
items[i].style.display = text.includes(filter) ? '' : 'none';
}
});
</script>