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+---
+title: CSS Box Model
+slug: Web/CSS/CSS_Box_Model
+tags:
+  - CSS
+  - CSS Box Model
+  - CSS Reference
+  - NeedsTranslation
+  - Overview
+  - TopicStub
+translation_of: Web/CSS/CSS_Box_Model
+---
+<div>{{CSSRef}}</div>
+
+<p><strong>CSS Box Model</strong> is a CSS module that defines the rectangular boxes, including their padding and margin, that are generated for elements and laid out according to the visual formatting model.</p>
+
+<h2 id="Reference">Reference</h2>
+
+<h3 id="Properties">Properties</h3>
+
+<h4 id="Properties_controlling_the_flow_of_content_in_a_box">Properties controlling the flow of content in a box</h4>
+
+<div class="index">
+<ul>
+ <li>{{cssxref("box-decoration-break")}}</li>
+ <li>{{cssxref("box-sizing")}}</li>
+ <li>{{cssxref("overflow")}}</li>
+ <li>{{cssxref("overflow-x")}}</li>
+ <li>{{cssxref("overflow-y")}}</li>
+</ul>
+</div>
+
+<h4 id="Properties_controlling_the_size_of_a_box">Properties controlling the size of a box</h4>
+
+<div class="index">
+<ul>
+ <li>{{cssxref("height")}}</li>
+ <li>{{cssxref("width")}}</li>
+ <li>{{cssxref("max-height")}}</li>
+ <li>{{cssxref("max-width")}}</li>
+ <li>{{cssxref("min-height")}}</li>
+ <li>{{cssxref("min-width")}}</li>
+</ul>
+</div>
+
+<h4 id="Properties_controlling_the_margins_of_a_box">Properties controlling the margins of a box</h4>
+
+<div class="index">
+<ul>
+ <li>{{cssxref("margin")}}</li>
+ <li>{{cssxref("margin-bottom")}}</li>
+ <li>{{cssxref("margin-left")}}</li>
+ <li>{{cssxref("margin-right")}}</li>
+ <li>{{cssxref("margin-top")}}</li>
+</ul>
+</div>
+
+<h4 id="Properties_controlling_the_paddings_of_a_box">Properties controlling the paddings of a box</h4>
+
+<div class="index">
+<ul>
+ <li>{{cssxref("padding")}}</li>
+ <li>{{cssxref("padding-bottom")}}</li>
+ <li>{{cssxref("padding-left")}}</li>
+ <li>{{cssxref("padding-right")}}</li>
+ <li>{{cssxref("padding-top")}}</li>
+</ul>
+</div>
+
+<h4 id="Other_properties">Other properties</h4>
+
+<div class="index">
+<ul>
+ <li>{{cssxref("box-shadow")}}</li>
+ <li>{{cssxref("visibility")}}</li>
+</ul>
+</div>
+
+<h2 id="Guides_and_tools">Guides and tools</h2>
+
+<dl>
+ <dt><a href="/en-US/docs/Web/CSS/CSS_Box_Model/Introduction_to_the_CSS_box_model">Introduction to the CSS box model</a></dt>
+ <dd>Explains one of the fundamental concept of CSS, the box model: describes the meaning of the margin, padding, as well as the different areas of a box.</dd>
+ <dt><a href="/en-US/docs/Web/CSS/CSS_Box_Model/Mastering_margin_collapsing">Mastering margin collapsing</a></dt>
+ <dd>In several cases, two adjacent margins are collapsed into one. This article describes when this is happening and how to control it.</dd>
+ <dt><a href="/en-US/docs/Web/CSS/CSS_Box_Model/Box-shadow_generator">Box-shadow generator</a></dt>
+ <dd>An interactive tool that allows to visually create shadows and to generate the needed syntax for the {{cssxref("box-shadow")}} property.</dd>
+</dl>
+
+<h2 id="Specifications">Specifications</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName("CSS3 Box")}}</td>
+   <td>{{Spec2("CSS3 Box")}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName("CSS2.1", "box.html")}}</td>
+   <td>{{Spec2("CSS2.1")}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName("CSS1")}}</td>
+   <td>{{Spec2("CSS1")}}</td>
+   <td>Initial definition</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<p>{{CompatibilityTable}}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari (WebKit)</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>1.0</td>
+   <td>{{CompatGeckoDesktop("1")}}</td>
+   <td>3.0</td>
+   <td>3.5</td>
+   <td>1.0 (85)</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>1.0</td>
+   <td>{{CompatGeckoMobile("1")}}</td>
+   <td>6.0</td>
+   <td>6.0</td>
+   <td>1.0</td>
+  </tr>
+ </tbody>
+</table>
+</div>
diff --git a/files/pt-pt/web/css/css_box_model/introducao_modelo_caixa_css/index.html b/files/pt-pt/web/css/css_box_model/introducao_modelo_caixa_css/index.html
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+---
+title: Introdução ao modelo de Caixa de CSS
+slug: Web/CSS/CSS_Box_Model/Introducao_modelo_caixa_CSS
+tags:
+  - CSS
+  - Modelo de Caixa de CSS
+  - Principiante
+  - Referencia
+translation_of: Web/CSS/CSS_Box_Model/Introduction_to_the_CSS_box_model
+---
+<p>{{CSSRef}}</p>
+
+<h2 id="Resumo">Resumo</h2>
+
+<p>In a document, each element is represented as a rectangular box. Determining the size, properties — like its color, background, borders aspect — and the position of these boxes is the goal of the rendering engine.</p>
+
+<p>In CSS, each of these rectangular boxes is described using the standard <em>box model</em>. This model describes the space of the content taken by an element. Each box has four edges: the <strong>margin edge</strong>, <strong>border edge</strong>, <strong>padding edge</strong>, and <strong>content edge</strong>.</p>
+
+<p><img alt="CSS Box model" src="https://mdn.mozillademos.org/files/8685/boxmodel-(3).png" style="height: 384px; width: 548px;"></p>
+
+<p><a name="content-area"></a>The <strong>content area</strong> is the area containing the real content of the element. It often has a background, a color or an image (in that order, an opaque image hiding the background color) and is located inside the <em>content edge</em>; its dimensions are the <em>content width</em>, or <em>content-box width</em>, and the <em>content height</em>, or <em>content-box height</em>.</p>
+
+<p>If the CSS {{ cssxref("box-sizing") }} property is set to default, the CSS properties {{ cssxref("width") }}, {{ cssxref("min-width") }}, {{ cssxref("max-width") }}, {{ cssxref("height") }}, {{ cssxref("min-height") }} and {{ cssxref("max-height") }} control the content size.</p>
+
+<p><a name="padding-area"></a>The <strong>padding area</strong> extends to the border surrounding the padding. When the content area has a background, color, or image set on it, this will extend into the padding, which is why you can think of the padding as extending the content. The padding is located inside the <em>padding edge</em>, and its dimensions are the <em>padding-box width</em> and the <em>padding-box height</em>.</p>
+
+<p>The space between the padding and the content edge can be controlled using the {{ cssxref("padding-top") }}, {{ cssxref("padding-right") }}, {{ cssxref("padding-bottom") }}, {{ cssxref("padding-left") }} and the shorthand {{ cssxref("padding") }} CSS properties.</p>
+
+<p><a name="border-area"></a>The <strong>border area</strong> extends the padding area to the area containing the borders. It is the area inside the <em>border edge</em>, and its dimensions are the <em>border-box width</em> and the <em>border-box height</em>. This area depends on the size of the border that is defined by the {{ cssxref("border-width") }} property or the shorthand {{ cssxref("border") }}.</p>
+
+<p><a name="margin-area"></a>The <strong>margin area</strong> extends the border area with an empty area used to separate the element from its neighbors. It is the area inside the <em>margin edge</em>, and its dimensions are the <em>margin-box width </em>and the <em>margin-box height</em>.</p>
+
+<p>The size of the margin area is controlled using the {{ cssxref("margin-top") }}, {{ cssxref("margin-right") }}, {{ cssxref("margin-bottom") }}, {{ cssxref("margin-left") }} and the shorthand {{ cssxref("margin") }} CSS properties.</p>
+
+<p>When <a href="/en/CSS/margin_collapsing" title="en/CSS/margin_collapsing">margin collapsing</a> happens, the margin area is not clearly defined since margins are shared between boxes.</p>
+
+<p>Finally, note that, for non-replaced inline elements, the amount of space taken up (the contribution to the height of the line) is determined by the {{ cssxref('line-height') }} property, even though the border and padding appear visually around the content.</p>
+
+<h2 id="Especificação">Especificação</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{ SpecName("CSS2.1","box.html#box-dimensions")}}</td>
+   <td>{{ Spec2('CSS2.1') }}</td>
+   <td>Though more precisely worded, there is no practical change</td>
+  </tr>
+  <tr>
+   <td>{{ SpecName("CSS1","#formatting-model")}}</td>
+   <td>{{ Spec2('CSS1') }}</td>
+   <td>Initial definition</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Consultar_também">Consultar também</h2>
+
+<ul>
+ <li><a href="/pt-PT/docs/Web/CSS/Refer%C3%AAncia_CSS" title="CSS Reference">Referência CSS</a></li>
+ <li>{{ CSS_key_concepts() }}</li>
+ <li>Related CSS properties: {{ cssxref("box-sizing") }}, {{ cssxref("background-clip") }}, {{ cssxref("height") }}, {{ cssxref("max-height") }}, {{ cssxref("min-height") }}, {{ cssxref("width") }}, {{ cssxref("max-height") }}, {{ cssxref("min-height") }}, {{ cssxref("padding") }}, {{ cssxref("padding-top") }}, {{ cssxref("padding-right") }}, {{ cssxref("padding-bottom") }}, {{ cssxref("padding-left") }}, {{ cssxref("border") }}, {{ cssxref("border-top") }}, {{ cssxref("border-right") }}, {{ cssxref("border-bottom") }}, {{ cssxref("border-left") }}, {{ cssxref("border-width") }}, {{ cssxref("border-top-width") }}, {{ cssxref("border-right-width") }}, {{ cssxref("border-bottom-width") }}, {{ cssxref("border-left-width") }}, {{ cssxref("margin") }}, {{ cssxref("margin-top") }}, {{ cssxref("margin-right") }}, {{ cssxref("margin-bottom") }}, {{ cssxref("margin-left") }}</li>
+</ul>