Annotation & XFA: Add focus outlines on different fields (bug 1723615, bug 1718528)

- set a default tabindex to be sure they'll be taken into account in the TAB cycle (https://bugzilla.mozilla.org/show_bug.cgi?id=1723615).
  - show default outline when fields are focused (it was an a11y bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1718528).

src/core/xfa/template.js

@@ -118,6 +118,9 @@ const MAX_ATTEMPTS_FOR_LRTB_LAYOUT = 2;
 // the loop after having MAX_EMPTY_PAGES empty pages.
 const MAX_EMPTY_PAGES = 3;
 
+// Default value to start with for the tabIndex property.
+const DEFAULT_TAB_INDEX = 5000;
+
 function getBorderDims(node) {
   if (!node || !node.border) {
     return { w: 0, h: 0 };
@@ -173,7 +176,12 @@ function* getContainedChildren(node) {
 
 function setTabIndex(node) {
   while (node) {
-    if (!node.traversal || node[$tabIndex]) {
+    if (!node.traversal) {
+      node[$tabIndex] = node[$getParent]()[$tabIndex];
+      return;
+    }
+
+    if (node[$tabIndex]) {
       return;
     }
 
@@ -186,6 +194,7 @@ function setTabIndex(node) {
     }
 
     if (!next || !next.ref) {
+      node[$tabIndex] = node[$getParent]()[$tabIndex];
       return;
     }
 
@@ -1755,6 +1764,8 @@ class Draw extends XFAObject {
   }
 
   [$toHTML](availableSpace) {
+    setTabIndex(this);
+
     if (this.presence === "hidden" || this.presence === "inactive") {
       return HTMLResult.EMPTY;
     }
@@ -2309,6 +2320,7 @@ class ExclGroup extends XFAObject {
   }
 
   [$toHTML](availableSpace) {
+    setTabIndex(this);
     if (
       this.presence === "hidden" ||
       this.presence === "inactive" ||
@@ -2611,6 +2623,8 @@ class Field extends XFAObject {
   }
 
   [$toHTML](availableSpace) {
+    setTabIndex(this);
+
     if (!this.ui) {
       // It's allowed to not have an ui, specs say:
       //   If the UI element contains no children or is not present,
@@ -2642,7 +2656,6 @@ class Field extends XFAObject {
       this.ui[$appendChild](node);
     }
 
-    setTabIndex(this);
     if (
       !this.ui ||
       this.presence === "hidden" ||
@@ -4833,6 +4846,8 @@ class Subform extends XFAObject {
   }
 
   [$toHTML](availableSpace) {
+    setTabIndex(this);
+
     if (this.break) {
       // break element is deprecated so plug it on one of its replacement
       // breakBefore or breakAfter.
@@ -5255,7 +5270,7 @@ class Template extends XFAObject {
     if (this.subform.children.length >= 2) {
       warn("XFA - Several subforms in template node: please file a bug.");
     }
-    this[$tabIndex] = 1000;
+    this[$tabIndex] = DEFAULT_TAB_INDEX;
   }
 
   [$isSplittable]() {

src/display/annotation_layer.js

@@ -33,6 +33,8 @@ import {
 import { AnnotationStorage } from "./annotation_storage.js";
 import { ColorConverters } from "../shared/scripting_utils.js";
 
+const DEFAULT_TAB_INDEX = 1000;
+
 /**
  * @typedef {Object} AnnotationElementParameters
  * @property {Object} data
@@ -722,6 +724,7 @@ class TextWidgetAnnotationElement extends WidgetAnnotationElement {
         element.type = "text";
         element.setAttribute("value", textContent);
       }
+      element.tabIndex = DEFAULT_TAB_INDEX;
 
       elementData.userValue = textContent;
       element.setAttribute("id", id);
@@ -978,6 +981,7 @@ class CheckboxWidgetAnnotationElement extends WidgetAnnotationElement {
       element.setAttribute("checked", true);
     }
     element.setAttribute("id", id);
+    element.tabIndex = DEFAULT_TAB_INDEX;
 
     element.addEventListener("change", function (event) {
       const name = event.target.name;
@@ -1052,6 +1056,7 @@ class RadioButtonWidgetAnnotationElement extends WidgetAnnotationElement {
       element.setAttribute("checked", true);
     }
     element.setAttribute("id", id);
+    element.tabIndex = DEFAULT_TAB_INDEX;
 
     element.addEventListener("change", function (event) {
       const { target } = event;
@@ -1148,6 +1153,7 @@ class ChoiceWidgetAnnotationElement extends WidgetAnnotationElement {
     selectElement.disabled = this.data.readOnly;
     selectElement.name = this.data.fieldName;
     selectElement.setAttribute("id", id);
+    selectElement.tabIndex = DEFAULT_TAB_INDEX;
 
     selectElement.style.fontSize = `${fontSize}px`;
 

web/annotation_layer_builder.css

@@ -95,6 +95,14 @@
   border: 1px solid transparent;
 }
 
+.annotationLayer .textWidgetAnnotation input :focus,
+.annotationLayer .textWidgetAnnotation textarea :focus,
+.annotationLayer .choiceWidgetAnnotation select :focus,
+.annotationLayer .buttonWidgetAnnotation.checkBox :focus,
+.annotationLayer .buttonWidgetAnnotation.radioButton :focus {
+  outline: auto;
+}
+
 .annotationLayer .buttonWidgetAnnotation.checkBox input:checked:before,
 .annotationLayer .buttonWidgetAnnotation.checkBox input:checked:after,
 .annotationLayer .buttonWidgetAnnotation.radioButton input:checked:before {

web/xfa_layer_builder.css

@@ -155,7 +155,13 @@
 .xfaSelect:focus {
   background-image: none;
   background-color: transparent;
-  outline: none;
+  outline: auto;
+  outline-offset: -1px;
+}
+
+.xfaCheckbox:focus,
+.xfaRadio:focus {
+  outline: auto;
 }
 
 .xfaTextfield,