fix(engine): fix issues related to element text calculation

accessibility-checker-engine/src/v2/checker/accessibility/util/legacy.ts

@@ -2521,13 +2521,14 @@ export class RPTUtil {
     public static isInnerTextOnlyEmpty(element) {
         // Get the innerText of the element
         let text = element.innerText;
-
-        if (text === undefined && element.textContent !== undefined) {
-            // In headless mode,  innerText is sometimes 'undefined'
+
+        if ((text === undefined || !text || text.trim().length === 0) && element.nodeName.toLowerCase() !== 'slot' && element.textContent !== undefined) {
+            //ignore slot because its text will be filled by the corresponding content in the light DOM 
+            // innerText is sometimes 'undefined' in headless mode, or null if the element is invisible or not erxpanded 
             // so we try textContent as a workaround
             text = element.textContent
         }
-
+        
         let retVal = !(text !== null && text.trim().length > 0);
         if (element.nodeType === 1 && element.nodeName.toLowerCase() === "slot") {
             //TODO: need to conside its own content, a slot may have its own content or assigned content
@@ -2642,7 +2643,7 @@ export class RPTUtil {
                     node.nodeName.toLowerCase() === "svg"
                     && RPTUtil.svgHasName(node as any)
                 );
-
+                
                 // Now we check if this node is of type element, visible
                 if (!hasContent && node.nodeType === 1 && VisUtil.isNodeVisible(node)) {
                     // Check if the innerText of the element is empty or not

accessibility-checker-engine/src/v4/rules/input_label_before.ts

@@ -11,7 +11,7 @@
   limitations under the License.
 *****************************************************************************/
 
-import { Rule, RuleResult, RuleFail, RuleContext, RulePotential, RuleManual, RulePass, RuleContextHierarchy } from "../api/IRule";
+import { Rule, RuleResult, RuleFail, RuleContext, RulePass, RuleContextHierarchy } from "../api/IRule";
 import { eRulePolicy, eToolkitLevel } from "../api/IRule";
 import { RPTUtil } from "../../v2/checker/accessibility/util/legacy";
 
@@ -58,14 +58,21 @@ export let input_label_before: Rule = {
 
         // Get only the non-hidden labels for element
         let labelElem = RPTUtil.getLabelForElementHidden(ruleContext, true);
-
+        
         if (labelElem == null || !RPTUtil.hasInnerContentHidden(labelElem)) {
             // Due to dependency, label must be done via title - this rule doesn't apply
             return null;
         }
 
         let value = RPTUtil.compareNodeOrder(labelElem, ruleContext);
         if (value == -2) {
+            // ignore if no label or the content for the label is only from the nested input control 
+            let text = RPTUtil.getInnerText(ruleContext);
+            if (text && text.trim().length > 0 && RPTUtil.getInnerText(ruleContext).trim() === text.trim()) {
+                // Due to dependency, label must be done via title - this rule doesn't apply
+                return null;
+            }
+
             // input nested in label
             let passed = false;
             let walkNode = ruleContext.previousSibling;

accessibility-checker-engine/src/v4/rules/label_content_exists.ts

@@ -11,7 +11,7 @@
   limitations under the License.
 *****************************************************************************/
 
-import { Rule, RuleResult, RuleFail, RuleContext, RulePotential, RuleManual, RulePass, RuleContextHierarchy } from "../api/IRule";
+import { Rule, RuleResult, RuleFail, RuleContext, RulePass, RuleContextHierarchy } from "../api/IRule";
 import { eRulePolicy, eToolkitLevel } from "../api/IRule";
 import { RPTUtil } from "../../v2/checker/accessibility/util/legacy";
 import { FragmentUtil } from "../../v2/checker/accessibility/util/fragment";

accessibility-checker-engine/test/v2/checker/accessibility/rules/input_label_before_ruleunit/D870.html

@@ -46,7 +46,7 @@ <h3>Input type Tests</h3>
 <label for="textarea1">
    <span></span>
    <textarea id="textarea1" aria-label="textarea1 label" rows="2" cols="50" name="autos"> 
-       Text area label is below input control 
+       no Text area label for the input control 
    </textarea>
 </label>
 

accessibility-checker-engine/test/v2/checker/accessibility/rules/label_content_exists_ruleunit/label-invisible-element.html

@@ -0,0 +1,91 @@
+<!DOCTYPE html>
+<!--
+   /******************************************************************************
+     Copyright:: 2020- IBM, Inc
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+  *****************************************************************************/
+-->
+
+<html lang="en-US">
+  <head>
+    <title>Shadow DOM input Label</title>
+    <meta charset="UTF-8" />
+  </head>
+  <body>
+    <main id="main">
+      <div className="App">
+        <details>
+          <summary>Detail summary</summary>
+          <div>
+            <label id="1" for="input">
+              <p>Detail Label Text</p>
+            </label>
+            <input id="input" type="text" />
+          </div>
+        </details>
+        <!--details>
+          <summary>Direct Detail summary</summary>
+          <div>
+            <label id="2" for="input">
+               Direct Detail Label Text
+            </label>
+            <input id="input" type="text" />
+          </div>
+        </details>
+        <div>
+          <summary>Div summary</summary>
+          <div>
+            <label id="3" for="input">
+              <p>Div Label Text</p>
+            </label>
+            <input id="input" type="text" />
+          </div>
+        </div>
+        <div>
+          <summary>Direct Div summary</summary>
+          <div>
+            <label id="4" for="input">
+              <p>Direct Div Label Text</p>
+            </label>
+            <input id="input" type="text" />
+          </div>
+        </div-->
+      </div>
+    </main>
+    <script type="text/javascript">
+      UnitTest = {
+          ruleIds: ["label_content_exists"],
+          results: [
+          {
+            "ruleId": "label_content_exists",
+            "value": [
+              "INFORMATION",
+              "PASS"
+            ],
+            "path": {
+              "dom": "/html[1]/body[1]/main[1]/div[1]/details[1]/div[1]/label[1]",
+              "aria": "/document[1]/main[1]/group[1]"
+            },
+            "reasonId": "Pass_Regular",
+            "message": "<label> element has accessible name with inner content",
+            "messageArgs": [],
+            "apiArgs": [],
+            "category": "Accessibility"
+          }
+      ]
+      }
+
+</script>
+  </body>
+</html>