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---
title: Firefox 70 para programadores
slug: Mozilla/Firefox/Releases/70
tags:
- '70'
- Firefox
- Lançamento
- Mozilla
translation_of: Mozilla/Firefox/Releases/70
---
<p>{{FirefoxSidebar}}{{Draft}}</p>
<p class="summary">Este artigo fornece informaçaõ acerca das alterações no Firefox 70 que irão afetar od programadores. O Firefox 70 é a <a href="https://www.mozilla.org/en-US/firefox/channel/desktop/#beta">versão Beta atual do Firefox</a>, e irá ser distribuida no dia <a href="https://wiki.mozilla.org/RapidRelease/Calendar#Future_branch_dates" rel="noopener">22 de outubro de 2019</a>.</p>
<h2 id="Alterações_para_os_programadores_da_Web">Alterações para os programadores da Web</h2>
<h3 id="Ferramentas_do_programador">Ferramentas do programador</h3>
<ul>
<li>An icon will be displayed next to invalid or unsupported <a href="/en-US/docs/Tools/Page_Inspector/How_to/Examine_and_edit_CSS#Examine_CSS_rules">CSS rules</a> in the Rules pane of the Page Inspector ({{bug(1306054)}}).</li>
</ul>
<h4 id="Removals">Removals</h4>
<h3 id="HTML">HTML</h3>
<p><em>No changes.</em></p>
<h4 id="Removals_2"> Removals</h4>
<h3 id="CSS">CSS</h3>
<ul>
<li>Opacity values like for {{cssxref("opacity")}} or {{SVGAttr("stop-opacity")}} can now be percentages ({{Bug(1562086)}}).</li>
<li>{{cssxref("grid-auto-columns")}} and {{cssxref("grid-auto-rows")}} now accept multiple track-size values ({{Bug(1339672)}}).</li>
<li>A number of text-related CSS properties have been enabled by default ({{bug(1573631)}}):
<ul>
<li>{{cssxref("text-decoration-thickness")}}.</li>
<li>{{cssxref("text-underline-offset")}}.</li>
<li>{{cssxref("text-decoration-skip-ink")}}. The default value is <code>auto</code>, which means that by default underlines and overlines are now interrupted where they would otherwise cross over a {{Glossary("glyph")}}.</li>
</ul>
</li>
<li>The {{cssxref("display")}} property now accepts two keywords for the inner and the outer display type ({{Bug(1038294)}}, {{Bug(1105868)}} and {{Bug(1557825)}}).</li>
<li>The {{cssxref("font-size")}} property now accepts the new keyword <code>xxx-large</code>. ({{Bug(1553545)}}).</li>
<li>The {{cssxref(":visited")}} pseudo-class no longer matches {{htmlelement("link")}} elements, for logic and performance reasons ({{bug(1572246)}}; see <span class="F0XO1GC-mb-Z" id="t-t"><a href="https://groups.google.com/forum/#!msg/mozilla.dev.platform/1NP6oJzK6zg/ftAz_TajAAAJ">Intent to ship: Make <link> elements always unvisited</a> and </span><a href="https://github.com/w3c/csswg-drafts/issues/3817">[selectors] :link and <link></a> for more reasoning as to why).</li>
<li>We now support an <code>auto</code> value for the {{cssxref("quotes")}} property ({{bug(1421938)}}).</li>
<li>Stylesheets contained in {{htmlelement("style")}} elements are now cached for reuse, to improve performance ({{bug(1480146)}}). Note that this currently doesn't include stylesheets that contain <code>@import</code> rules.</li>
<li>The <code><ratio></code> type now accepts <code><number></code> / <code><number></code> or a single <code><number></code> as a value. ({{bug(1565562)}}).</li>
</ul>
<h4 id="Removals_3">Removals</h4>
<ul>
<li>Retiring support for 3-valued <position> (excluding background)({{Bug(1559276)}}). <a href="https://www.fxsitecompat.dev/en-CA/docs/2019/3-valued-css-position-is-no-longer-supported-except-for-background-position/">See site compat note</a>.</li>
<li><code>none</code> is now invalid in {{cssxref("counter")}} / {{cssxref("counters")}} — a change which makes the Level 3 spec match CSS 2.1 {{Bug(1576821)}}).</li>
</ul>
<h3 id="SVG">SVG</h3>
<p><em>No changes.</em></p>
<h4 id="Removals_4">Removals</h4>
<h3 id="JavaScript">JavaScript</h3>
<ul>
<li>Add support for numeric separators. {{Bug(1435818)}}.</li>
</ul>
<h4 id="Removals_5">Removals</h4>
<h3 id="APIs">APIs</h3>
<ul>
<li>The {{domxref("History.back","back()")}}, {{domxref("History.forward","forward()")}}, and {{domxref("History.go","go()")}} methods are now asynchronous. Add a listener to the <code>{{domxref("Document/defaultView/popstate_event", "popstate")}}</code> event to get notification that navigation has completed {{Bug(1563587)}}.</li>
</ul>
<h4 id="Novas_APIs">Novas APIs</h4>
<h4 id="DOM">DOM</h4>
<ul>
<li>Add {{DOMxRef("DOMMatrix")}}, {{DOMxRef("DOMPoint")}}, etc. support in web workers ({{bug(1420580)}}).</li>
</ul>
<h4 id="Eventos_DOM">Eventos DOM</h4>
<h4 id="Service_workers">Service workers</h4>
<h4 id="Media_Web_Audio_and_WebRTC">Media, Web Audio, and WebRTC</h4>
<h4 id="Canvas_and_WebGL">Canvas and WebGL</h4>
<ul>
<li>We now support {{domxref("CanvasRenderingContext2D.getTransform()")}}, and the newer variant of {{domxref("CanvasRenderingContext2D.setTransform()")}} that accepts a matrix object as a parameter rather than multiple parameters representing the individual components of the matrix ({{bug(928150)}}).</li>
</ul>
<h4 id="Removals_6">Removals</h4>
<h3 id="Segurança">Segurança</h3>
<p><em>No changes.</em></p>
<h4 id="Removals_7">Removals</h4>
<h3 id="Plug-ins">Plug-ins</h3>
<p><em>No changes.</em></p>
<h4 id="Removals_8">Removals</h4>
<h3 id="Outros">Outros</h3>
<p><em>No changes.</em></p>
<h4 id="Removals_9">Removals</h4>
<h2 id="Alterações_para_os_programadores_de_extras_add-on">Alterações para os programadores de extras (add-on)</h2>
<h3 id="Alterações_de_API">Alterações de API</h3>
<p><em>Sem alterações.</em></p>
<h4 id="Removals_10">Removals</h4>
<h3 id="Alfetarções_de_Manifest">Alfetarções de Manifest</h3>
<p><em>Sem alterações.</em></p>
<h4 id="Removals_11">Removals</h4>
<h2 id="Consultar_também">Consultar também:</h2>
<ul>
<li><a href="https://www.fxsitecompat.com/en-CA/versions/70/">SCompatibilidade de Site para o Firefox 70</a></li>
</ul>
<h2 id="Versões_antigas">Versões antigas</h2>
<p>{{Firefox_for_developers(69)}}</p>
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