---
title: Firefox 70 for developers
slug: Mozilla/Firefox/Releases/70
translation_of: Mozilla/Firefox/Releases/70
---
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This article provides information about the changes in Firefox 70 that will affect developers. Firefox 70 is the current Nightly version of Firefox, and will ship on October 22, 2019.
Changes for web developers
- An icon will be displayed next to invalid or unsupported CSS rules in the Rules pane of the Page Inspector ({{bug(1306054)}}).
Removals
HTML
No changes.
Removals
CSS
- [fill-stroke] [filter-effects] [css-color] percentage opacity. {{Bug(1562086)}}
- [css-grid] grid-auto-columns/rows should accept multiple track-size values. {{Bug(1339672)}}
- [css-text-decor-4] Implement text-decoration-skip-ink. {{Bug(1411922)}}
- [css-display-3] Implement multi-keyword {{CSSxRef("display")}} values. ({{Bug(1038294)}}, {{Bug(1105868)}} and {{Bug(1557825)}})
- [filter-effects-2] Implement backdrop-filter. {{Bug(1178765)}}
Removals
SVG
No changes.
Removals
JavaScript
- Add support for numeric separators. {{Bug(1435818)}}
Removals
APIs
New APIs
DOM
- Add {{DOMxRef("DOMMatrix")}}, {{DOMxRef("DOMPoint")}}, etc. support in web workers ({{bug(1420580)}}).
DOM events
Service workers
Canvas and WebGL
Removals
Security
No changes.
Removals
Plugins
No changes.
Removals
Other
No changes.
Removals
Changes for add-on developers
API changes
No changes.
Removals
Manifest changes
No changes.
Removals
See also
Older versions
{{Firefox_for_developers(69)}}