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diff --git a/dom/webidl/Grid.webidl b/dom/webidl/Grid.webidl
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+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/* These objects support visualization of a css-grid by the dev tools. */
+
+/**
+ * Explicit and implicit types apply to tracks, lines, and areas.
+ * https://drafts.csswg.org/css-grid/#explicit-grids
+ * https://drafts.csswg.org/css-grid/#implicit-grids
+ */
+enum GridDeclaration { "explicit", "implicit" };
+
+/**
+ * Tracks expanded from auto-fill are repeat , auto-fits with elements are
+ * also repeat, auto-fits with no elements are removed, other tracks are static.
+ */
+enum GridTrackState { "static", "repeat", "removed" };
+
+[ChromeOnly,
+ Exposed=Window]
+interface Grid
+{
+  readonly attribute GridDimension rows;
+  readonly attribute GridDimension cols;
+  [Cached, Constant]
+  readonly attribute sequence<GridArea> areas;
+};
+
+[ChromeOnly,
+ Exposed=Window]
+interface GridDimension
+{
+  readonly attribute GridLines lines;
+  readonly attribute GridTracks tracks;
+};
+
+[ChromeOnly,
+ Exposed=Window]
+interface GridLines
+{
+  readonly attribute unsigned long length;
+
+  /**
+   * This accessor method allows array-like access to lines.
+   * @param index A 0-indexed value.
+   */
+  getter GridLine? item(unsigned long index);
+};
+
+[ChromeOnly,
+ Exposed=Window]
+interface GridLine
+{
+  /**
+   * Names include both explicit names and implicit names, which will be
+   * assigned if the line contributes to a named area.
+   * https://drafts.csswg.org/css-grid/#implicit-named-lines
+   */
+  [Cached, Constant]
+  readonly attribute sequence<DOMString> names;
+
+  readonly attribute double start;
+
+  /**
+   * Breadth is the gap between the start of this line and the start of the
+   * next track in flow direction. It primarily is set by use of the -gap
+   * properties.
+   * https://drafts.csswg.org/css-grid/#gutters
+   */
+  readonly attribute double breadth;
+
+  readonly attribute GridDeclaration type;
+
+  /**
+   * Number is the 1-indexed index of the line in flow order. The
+   * first explicit line has number 1, and numbers increment by 1 for
+   * each line after that. Lines before the first explicit line
+   * have number 0, which is not a valid addressable line number, and
+   * should be filtered out by callers.
+   */
+  readonly attribute unsigned long number;
+
+  /**
+   * NegativeNumber is the 1-indexed index of the line in reverse
+   * flow order. The last explicit line has negativeNumber -1, and
+   * negativeNumbers decrement by 1 for each line before that.
+   * Lines after the last explicit line have negativeNumber 0, which
+   * is not a valid addressable line number, and should be filtered
+   * out by callers.
+   */
+  readonly attribute long negativeNumber;
+};
+
+[ChromeOnly,
+ Exposed=Window]
+interface GridTracks
+{
+  readonly attribute unsigned long length;
+
+  /**
+   * This accessor method allows array-like access to tracks.
+   * @param index A 0-indexed value.
+   */
+  getter GridTrack? item(unsigned long index);
+};
+
+[ChromeOnly,
+ Exposed=Window]
+interface GridTrack
+{
+  readonly attribute double start;
+  readonly attribute double breadth;
+  readonly attribute GridDeclaration type;
+  readonly attribute GridTrackState state;
+};
+
+[ChromeOnly,
+ Exposed=Window]
+interface GridArea
+{
+  readonly attribute DOMString name;
+  readonly attribute GridDeclaration type;
+
+  /**
+   * These values are 1-indexed line numbers bounding the area.
+   */
+  readonly attribute unsigned long rowStart;
+  readonly attribute unsigned long rowEnd;
+  readonly attribute unsigned long columnStart;
+  readonly attribute unsigned long columnEnd;
+};