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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 flex containers by the
+ * dev tools.
+ */
+
+/**
+ * A flex container's main and cross axes are either horizontal or
+ * vertical, each with two possible directions.
+ */
+enum FlexPhysicalDirection {
+  "horizontal-lr",
+  "horizontal-rl",
+  "vertical-tb",
+  "vertical-bt",
+};
+
+[ChromeOnly, Exposed=Window]
+interface Flex
+{
+  sequence<FlexLineValues> getLines();
+
+  /**
+   * The physical direction in which successive flex items are placed,
+   * within a flex line in this flex container.
+   */
+  readonly attribute FlexPhysicalDirection mainAxisDirection;
+
+  /**
+   * The physical direction in which successive flex lines are placed
+   * in this flex container (if it is or were multi-line).
+   */
+  readonly attribute FlexPhysicalDirection crossAxisDirection;
+};
+
+/**
+ * This indicates which flex factor (flex-grow vs. flex-shrink) the
+ * flex layout algorithm uses internally when resolving flexible sizes
+ * in a given flex line, per flexbox spec section 9.7 step 1. Note that
+ * this value doesn't necessarily mean that any items on this line
+ * are *actually* growing (or shrinking).  This simply indicates what
+ * the layout algorithm "wants" to do, based on the free space --
+ * and items will stretch from their flex base size in the corresponding
+ * direction, if permitted by their min/max constraints and their
+ * corresponding flex factor.
+ */
+enum FlexLineGrowthState { "shrinking", "growing" };
+
+[ChromeOnly, Exposed=Window]
+interface FlexLineValues
+{
+  readonly attribute FlexLineGrowthState growthState;
+  readonly attribute double crossStart;
+  readonly attribute double crossSize;
+
+  // firstBaselineOffset measures from flex-start edge.
+  readonly attribute double firstBaselineOffset;
+
+  // lastBaselineOffset measures from flex-end edge.
+  readonly attribute double lastBaselineOffset;
+
+  /**
+   * getItems() returns FlexItemValues only for the Elements in
+   * this Flex container -- ignoring struts and abs-pos Elements.
+   */
+  sequence<FlexItemValues> getItems();
+};
+
+/**
+ * Item main sizes have either been unclamped, clamped to the minimum,
+ * or clamped to the maximum.
+ */
+enum FlexItemClampState {
+  "unclamped", "clamped_to_min", "clamped_to_max"
+};
+
+[ChromeOnly, Exposed=Window]
+interface FlexItemValues
+{
+  readonly attribute Node? node;
+  readonly attribute DOMRectReadOnly frameRect;
+  readonly attribute double mainBaseSize;
+  readonly attribute double mainDeltaSize;
+  readonly attribute double mainMinSize;
+  readonly attribute double mainMaxSize;
+  readonly attribute double crossMinSize;
+  readonly attribute double crossMaxSize;
+  readonly attribute FlexItemClampState clampState;
+};