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diff --git a/devtools/client/accessibility/constants.js b/devtools/client/accessibility/constants.js
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+/* 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/. */
+"use strict";
+
+const {
+  accessibility: {
+    AUDIT_TYPE,
+    ISSUE_TYPE: {
+      [AUDIT_TYPE.KEYBOARD]: {
+        FOCUSABLE_NO_SEMANTICS,
+        FOCUSABLE_POSITIVE_TABINDEX,
+        INTERACTIVE_NO_ACTION,
+        INTERACTIVE_NOT_FOCUSABLE,
+        MOUSE_INTERACTIVE_ONLY,
+        NO_FOCUS_VISIBLE,
+      },
+      [AUDIT_TYPE.TEXT_LABEL]: {
+        AREA_NO_NAME_FROM_ALT,
+        DIALOG_NO_NAME,
+        DOCUMENT_NO_TITLE,
+        EMBED_NO_NAME,
+        FIGURE_NO_NAME,
+        FORM_FIELDSET_NO_NAME,
+        FORM_FIELDSET_NO_NAME_FROM_LEGEND,
+        FORM_NO_NAME,
+        FORM_NO_VISIBLE_NAME,
+        FORM_OPTGROUP_NO_NAME_FROM_LABEL,
+        FRAME_NO_NAME,
+        HEADING_NO_CONTENT,
+        HEADING_NO_NAME,
+        IFRAME_NO_NAME_FROM_TITLE,
+        IMAGE_NO_NAME,
+        INTERACTIVE_NO_NAME,
+        MATHML_GLYPH_NO_NAME,
+        TOOLBAR_NO_NAME,
+      },
+    },
+  },
+} = require("resource://devtools/shared/constants.js");
+
+// Used in accessible component for properties tree rendering.
+exports.TREE_ROW_HEIGHT = 21;
+
+// Initial sidebar width.
+exports.SIDEBAR_WIDTH = "350px";
+
+// When value is updated either in the tree or sidebar.
+exports.VALUE_FLASHING_DURATION = 500;
+// When new row is selected, flash highlighter.
+exports.VALUE_HIGHLIGHT_DURATION = 1000;
+
+// If the panel width is smaller than given amount of pixels,
+// the sidebar automatically switches from 'landscape' to 'portrait' mode.
+exports.PORTRAIT_MODE_WIDTH = 700;
+
+// Names for Redux actions.
+exports.FETCH_CHILDREN = "FETCH_CHILDREN";
+exports.UPDATE_DETAILS = "UPDATE_DETAILS";
+exports.RESET = "RESET";
+exports.SELECT = "SELECT";
+exports.HIGHLIGHT = "HIGHLIGHT";
+exports.UNHIGHLIGHT = "UNHIGHLIGHT";
+exports.ENABLE = "ENABLE";
+exports.UPDATE_CAN_BE_DISABLED = "UPDATE_CAN_BE_DISABLED";
+exports.UPDATE_CAN_BE_ENABLED = "UPDATE_CAN_BE_ENABLED";
+exports.UPDATE_PREF = "UPDATE_PREF";
+exports.FILTER_TOGGLE = "FILTER_TOGGLE";
+exports.AUDIT = "AUDIT";
+exports.AUDITING = "AUDITING";
+exports.AUDIT_PROGRESS = "AUDIT_PROGRESS";
+exports.SIMULATE = "SIMULATE";
+exports.UPDATE_DISPLAY_TABBING_ORDER = "UPDATE_DISPLAY_TABBING_ORDER";
+
+// List of filters for accessibility checks.
+exports.FILTERS = {
+  NONE: "NONE",
+  ALL: "ALL",
+  [AUDIT_TYPE.CONTRAST]: "CONTRAST",
+  [AUDIT_TYPE.KEYBOARD]: "KEYBOARD",
+  [AUDIT_TYPE.TEXT_LABEL]: "TEXT_LABEL",
+};
+
+// Ordered accessible properties to be displayed by the accessible component.
+exports.ORDERED_PROPS = [
+  "name",
+  "role",
+  "actions",
+  "value",
+  "DOMNode",
+  "description",
+  "keyboardShortcut",
+  "childCount",
+  "indexInParent",
+  "states",
+  "relations",
+  "attributes",
+];
+
+// Accessible events (emitted by accessible front) that the accessible component
+// listens to for a current accessible.
+exports.ACCESSIBLE_EVENTS = [
+  "actions-change",
+  "attributes-change",
+  "description-change",
+  "name-change",
+  "reorder",
+  "shortcut-change",
+  "states-change",
+  "text-change",
+  "value-change",
+  "index-in-parent-change",
+];
+
+// Telemetry name constants.
+exports.A11Y_SERVICE_DURATION =
+  "DEVTOOLS_ACCESSIBILITY_SERVICE_TIME_ACTIVE_SECONDS";
+
+// URL constants
+exports.A11Y_LEARN_MORE_LINK =
+  "https://firefox-source-docs.mozilla.org/devtools-user/accessibility_inspector/";
+exports.A11Y_CONTRAST_LEARN_MORE_LINK =
+  "https://developer.mozilla.org/docs/Web/Accessibility/Understanding_WCAG/Perceivable/" +
+  "Color_contrast?utm_source=devtools&utm_medium=a11y-panel-checks-color-contrast";
+exports.A11Y_SIMULATION_DOCUMENTATION_LINK =
+  "https://firefox-source-docs.mozilla.org/devtools-user/accessibility_inspector/simulation/";
+
+const A11Y_TEXT_LABEL_LINK_BASE =
+  "https://developer.mozilla.org/docs/Web/Accessibility/Understanding_WCAG/Text_labels_and_names" +
+  "?utm_source=devtools&utm_medium=a11y-panel-checks-text-label";
+
+const A11Y_TEXT_LABEL_LINK_IDS = {
+  [AREA_NO_NAME_FROM_ALT]:
+    "Use_alt_attribute_to_label_area_elements_that_have_the_href_attribute",
+  [DIALOG_NO_NAME]: "Dialogs_should_be_labeled",
+  [DOCUMENT_NO_TITLE]: "Documents_must_have_a_title",
+  [EMBED_NO_NAME]: "Embedded_content_must_be_labeled",
+  [FIGURE_NO_NAME]: "Figures_with_optional_captions_should_be_labeled",
+  [FORM_FIELDSET_NO_NAME]: "Fieldset_elements_must_be_labeled",
+  [FORM_FIELDSET_NO_NAME_FROM_LEGEND]: "Use_a_legend_to_label_a_fieldset",
+  [FORM_NO_NAME]: "Form_elements_must_be_labeled",
+  [FORM_NO_VISIBLE_NAME]: "Form_elements_should_have_a_visible_text_label",
+  [FORM_OPTGROUP_NO_NAME_FROM_LABEL]:
+    "Use_label_attribute_on_optgroup_elements",
+  [FRAME_NO_NAME]: "Frame_elements_must_be_labeled",
+  [HEADING_NO_NAME]: "Headings_must_be_labeled",
+  [HEADING_NO_CONTENT]: "Headings_should_have_visible_text_content",
+  [IFRAME_NO_NAME_FROM_TITLE]: "Use_title_attribute_to_describe_iframe_content",
+  [IMAGE_NO_NAME]: "Content_with_images_must_be_labeled",
+  [INTERACTIVE_NO_NAME]: "Interactive_elements_must_be_labeled",
+  [MATHML_GLYPH_NO_NAME]: "Use_alt_attribute_to_label_mglyph_elements",
+  [TOOLBAR_NO_NAME]:
+    "Toolbars_must_be_labeled_when_there_is_more_than_one_toolbar",
+};
+
+const A11Y_TEXT_LABEL_LINKS = {};
+for (const key in A11Y_TEXT_LABEL_LINK_IDS) {
+  A11Y_TEXT_LABEL_LINKS[
+    key
+  ] = `${A11Y_TEXT_LABEL_LINK_BASE}#${A11Y_TEXT_LABEL_LINK_IDS[key]}`;
+}
+exports.A11Y_TEXT_LABEL_LINKS = A11Y_TEXT_LABEL_LINKS;
+
+const A11Y_KEYBOARD_LINK_BASE =
+  "https://developer.mozilla.org/docs/Web/Accessibility/Understanding_WCAG/Keyboard" +
+  "?utm_source=devtools&utm_medium=a11y-panel-checks-keyboard";
+
+const A11Y_KEYBOARD_LINK_IDS = {
+  [FOCUSABLE_NO_SEMANTICS]:
+    "Focusable_elements_should_have_interactive_semantics",
+  [FOCUSABLE_POSITIVE_TABINDEX]:
+    "Avoid_using_tabindex_attribute_greater_than_zero",
+  [INTERACTIVE_NO_ACTION]:
+    "Interactive_elements_must_be_able_to_be_activated_using_a_keyboard",
+  [INTERACTIVE_NOT_FOCUSABLE]: "Interactive_elements_must_be_focusable",
+  [MOUSE_INTERACTIVE_ONLY]:
+    "Clickable_elements_must_be_focusable_and_should_have_interactive_semantics",
+  [NO_FOCUS_VISIBLE]: "Focusable_element_must_have_focus_styling",
+};
+
+const A11Y_KEYBOARD_LINKS = {};
+for (const key in A11Y_KEYBOARD_LINK_IDS) {
+  A11Y_KEYBOARD_LINKS[
+    key
+  ] = `${A11Y_KEYBOARD_LINK_BASE}#${A11Y_KEYBOARD_LINK_IDS[key]}`;
+}
+exports.A11Y_KEYBOARD_LINKS = A11Y_KEYBOARD_LINKS;
+
+// Lists of preference names and keys.
+const PREFS = {
+  SCROLL_INTO_VIEW: "SCROLL_INTO_VIEW",
+};
+
+exports.PREFS = PREFS;
+exports.PREF_KEYS = {
+  [PREFS.SCROLL_INTO_VIEW]: "devtools.accessibility.scroll-into-view",
+};