Firefox 59 for developers

This article provides information about the changes in Firefox 59 that will affect developers. Firefox 59 was released on March 13, 2018.

Изменения для веб-разработчиков

Инструменты для разработчиков

• The Network Monitor Response tab now shows a preview of the rendered HTML — if the response is HTML (баг 1353319).
• Cookie information shown in the Storage Inspector (see Cookies) now includes a sameSite column showing what the same-site status of each cookie is (баг 1298370).
• The Rulers tool now includes a readout showing the current dimensions of the viewport (баг 1402633).
• In Responsive Design Mode, you can now set the screen dimensions using the cursor keys (баг 1421663). See the Setting screen size section for more details.
• The Raw headers display in the Network Monitor Headers tab now includes the response's status code (баг 1419401).

HTML

The <textarea> element's autocomplete attribute has been implemented. This lets you enable or disable form auto-fill for the element.

CSS

• The overscroll-behavior property and its associated longhand properties — overscroll-behavior-x and overscroll-behavior-y — have been implemented (баг 951793), and it has been enabled by default on all releases (баг 1428879).
• The behavior of "unusual elements" (elements that aren’t rendered purely by CSS box concepts such as replaced elements) when given a display value of contents has been updated as per spec (баг 1427292). See Appendix B: Effects of display: contents on Unusual Elements for exactly what the specced behaviors are.
• position sticky is now supported on appropriate HTML table parts (e.g. <th> elements) (баг 975644).
• calc() is now supported in <color> values — rgb(), rgba(), hsl(), and hsla() (баг 984021).
• calc() in media query values is now supported баг 1396057.
• The @document at-rule has been limited to use only in user and UA sheets (баг 1035091).
• Implement the font-optical-sizing property (баг 1435692).

SVG

Нет изменений.

JavaScript

Нет изменений.

APIs

New APIs

PointerEvents have been enabled in Firefox Desktop (баг 1411467).

DOM

• The EventTarget() constructor has been implemented (баг 1379688).
• The Response() constructor can now accept a null value for its body parameter, as per spec (баг 1303025).

DOM events

The Event.composedPath() method has been implemented (баг 1412775).

Service workers

• The service worker Clients API can now find and communicate with windows in a separate browser process (баг 1293277) .
• Nested about:blank and about:srcdoc iframes will now inherit their parent's controlling service worker. Fixed in (баг 1293277) and (баг 1426979).
• When a service worker provides a Response to FetchEvent.respondWith(), the Response.url value will not be propagated to the intercepted network request as the final resolved URL.  In the past the FetchEvent.request.url was used for this instead.  This means, for example, if a service worker intercepts a stylesheet or worker script, then the provided Response.url will be used to resolve any relative @import or importScripts() subresource loads (баг 1222008).
• FetchEvent.respondWith() will now trigger a network error if the FetchEvent.request.mode is "same-origin" and the provided Response.type is "cors". (баг 1222008)

Media and WebRTC

• The MediaStreamTrack property MediaStreamTrack.muted, along with the events mute and unmute and the corresponding event handlers, onmute and onunmute, have been implemented. A track's muted state indicates that the track is not currently able to provide media data.
  Note: The muted state of a track isn't useful for what's typically thought of as muting and unmuting a track. Instead, use the enabled property; setting enabled to false causes the track to output only empty frames.
• The RTCRtpReceiver methods getContributingSources() and getSynchronizationSources() have been implemented to provide information about the sources of each RTP stream. However, a specification change occurred before release and we have disabled these by default behind the preference media.peerconnection.rtpsourcesapi.enable (баг 1363667, баг 1430213, and баг 1433236.
• The RTCRtpTransceiver interface has now been implemented, since the Firefox implementation of WebRTC now supports transceivers, with RTCPeerConnection and other interfaces updated to use them per the latest specification.
• The RTCPeerConnection.addTransceiver() method has been added. In addition, the behavior of addTrack() has been updated to create a transceiver as required.
• Support for WebVTT regions was implemented in Firefox 58 but disabled by default. They're now available by default (баг 1415805).
• Firefox now supports WebVTT REGION definition blocks whose settings list has one setting per line instead of all of the settings being on the same line of the WebVTT file (баг 1415821.

Canvas and WebGL

No changes.

CSSOM

The CSSNamespaceRule interface and its namespaceURL and prefix properties have been implemented (баг 1326514).

HTTP

No changes.

Security

• Top-level navigation to data: URIs has been blocked баг 1401895. See Blocking Top-Level Navigations to data URLs for Firefox 59 for more details.
• The SAMEORIGIN directive of the X-Frame-Options header has been changed so that it checks not only the top-level IFrame is in the same origin, but all its ancestors as well (баг 725490).
• Image resources loaded from different origins to the current document are no longer able to trigger HTTP authentication dialogs (баг 1423146). See HTTP auth dialog can no longer be triggered by cross-origin images for more details.
• HTTP authentication now uses utf-8 encoding for usernames and passwords (rather than ISO-8859-1) for parity with other browsers, and to avoid potential problems as described in баг 1419658.
• Everyday the HSTS preload list is updated from Google. Normally this doesn't warrant a note, but in this release new TLDs were included, notably .app and .dev. While they are new TLDs developers might have used them for local development and be surprised by this change. Note that reserved TLDs should be used for local development instead.

Plugins

No changes.

Other

No changes.

Удаления из веб-платформы

HTML

Нестандартный параметр version  атрибута свойства type элемента <script> (например,  type="application/javascript;version=1.8") был удален (баг 1428745).

CSS

• Проприетарная единица mozmm <length> была удалена (баг 1416564).
• Проприетарные свойства -moz-border-top-colors, -moz-border-right-colors, -moz-border-bottom-colors и -moz-border-left-colors have been limited to usage in chrome code only (баг 1417200).

JavaScript

• Нестандартные условные блоки catch были удалены (баг 1228841).

APIs

• Нестандартный метод Event.getPreventDefault() был удален. Вам стоит использовать свойство Event.defaultPrevented чтобы определять, вызывался ли preventDefault() на событии Event.
• Проприетарное свойство Navigator.mozNotification и интерфейс DesktopNotification  были удалены, в пользу стандартного Notifications API (баг 952453).
• Проприетарный метод window.external.addSearchEngine() был удален (баг 862147). Смотреть также Window.sidebar для больших подробностей.
• Нестандартное поддерживающиеся только Firefox свойство HTMLMediaElement mozAutoplayEnabled было удалено.

SVG

Поддержка для свойства SMIL accessKey была удалена (баг 1423098).

Other

Поддержка для нестандартных протоколов pcast: и feed: была удалена (баг 1420622).

Changes for add-on and Mozilla developers

WebExtensions

• Theme updates:
  • new properties: colors.background_tab_text, colors.toolbar_field_border
  • all color properties now support both Chrome-style arrays and CSS color values.
• New browser settings:
  • contextMenuShowEvent
  • openBookmarksInNewTabs
  • openSearchResultsInNewTabs
  • proxyConfig
• New tabs APIs:
  • tabs.captureTab()
  • tabs.hide()
  • tabs.show()
• The contextMenus API now supports a "bookmark" context.
• New contentScripts API enables runtime registration of content scripts.
• New pageAction, browserAction, SidebarAction APIs:
  • browserAction/pageAction/sidebarAction.set* functions now accept null to undo changes.
  • browserAction.isEnabled(), pageAction.isShown() , sidebarAction.isOpen() functions.
• New option in page_action to show page actions by default.
• New values for protocol_handers:
  • "ssb" for Secure Scuttlebutt communications
  • "dat" for DATproject
  • "ipfs", "ipns", "dweb" for IPFS
• New privacy.websites setting "cookieConfig".
• Support in cookies API for first-party isolation.
• New option upgradeToSecure in webRequest.

Смотреть также

Совместимость сайтов с Firefox 59

Старые версии