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---
title: Firefox 70 for developers
slug: Mozilla/Firefox/Releases/70
translation_of: Mozilla/Firefox/Releases/70
---
<p>{{FirefoxSidebar}}{{Draft}}</p>
<p class="summary">This article provides information about the changes in Firefox 70 that will affect developers. Firefox 70 is the current <a href="https://www.mozilla.org/en-US/firefox/channel/desktop/#nightly">Nightly version of Firefox</a>, and will ship on <a href="https://wiki.mozilla.org/RapidRelease/Calendar#Future_branch_dates" rel="noopener">October 22, 2019</a>.</p>
<h2 id="Changes_for_web_developers">Changes for web developers</h2>
<h3 id="Developer_tools">Developer tools</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>[fill-stroke] [filter-effects] [css-color] percentage opacity. {{Bug(1562086)}}</li>
<li>[css-grid] <a href="/en-US/docs/Web/CSS/grid-auto-columns">grid-auto-columns</a>/<a href="/en-US/docs/Web/CSS/grid-auto-rows">rows</a> should accept multiple track-size values. {{Bug(1339672)}}</li>
<li>[css-text-decor-4] Implement <a href="/en-US/docs/Web/CSS/text-decoration-skip-ink">text-decoration-skip-ink</a>. {{Bug(1411922)}}</li>
<li>[css-display-3] Implement multi-keyword {{CSSxRef("display")}} values. ({{Bug(1038294)}}, {{Bug(1105868)}} and {{Bug(1557825)}})</li>
<li>[filter-effects-2] Implement backdrop-filter. {{Bug(1178765)}}</li>
</ul>
<h4 id="Removals_3">Removals</h4>
<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>
<h4 id="New_APIs">New 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="DOM_events">DOM events</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>
<h4 id="Removals_6">Removals</h4>
<h3 id="Security">Security</h3>
<p><em>No changes.</em></p>
<h4 id="Removals_7">Removals</h4>
<h3 id="Plugins">Plugins</h3>
<p><em>No changes.</em></p>
<h4 id="Removals_8">Removals</h4>
<h3 id="Other">Other</h3>
<p><em>No changes.</em></p>
<h4 id="Removals_9">Removals</h4>
<h2 id="Changes_for_add-on_developers">Changes for add-on developers</h2>
<h3 id="API_changes">API changes</h3>
<p><em>No changes.</em></p>
<h4 id="Removals_10">Removals</h4>
<h3 id="Manifest_changes">Manifest changes</h3>
<p><em>No changes.</em></p>
<h4 id="Removals_11">Removals</h4>
<h2 id="See_also">See also</h2>
<ul>
<li><a href="https://www.fxsitecompat.com/en-CA/versions/70/">Site compatibility for Firefox 70</a></li>
</ul>
<h2 id="Older_versions">Older versions</h2>
<p>{{Firefox_for_developers(69)}}</p>
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