Update index.html

- Updates the listed inputs and button types to steps more consistent in wording.
- incorporates w3c/accname#246 into the label steps for the mentioned form controls
- starting to migrate from just using "subtree" to "text equivalent computation of the element's subtree" - as the simple use of 'subtree' has come up in a handful of reviews for html aam naming steps

the "other form controls" is not touched in this update - as there are also other pending PRs - re select element - that start breaking that apart.

html-aam/index.html

@@ -16051,64 +16051,102 @@ <h2>Accessible Name and Description Computation</h2>
         <h3>Accessible Name Computations By HTML Element</h3>
         <section>
           <h4>
-            `input type="text"`, `input type="password"`, `input type="number"`, `input type="search"`,` input type="tel"`, `input type="email"`, `input type="url"` and `textarea` Element Accessible
+            `input type="text"`, `input type="password"`, `input type="number"`, `input type="search"`,` input type="tel"`, `input type="email"`, `input type="url"` and `textarea` Elements Accessible
             Name Computation
           </h4>
           <ol>
             <li>
-              If the control has an <a data-cite="wai-aria-1.2/#aria-label">`aria-label`</a> or an <a data-cite="wai-aria-1.2/#aria-labelledby">`aria-labelledby`</a> attribute the
+              If the control has an <a data-cite="wai-aria-1.2/#aria-label">`aria-label`</a> 
+              or an <a data-cite="wai-aria-1.2/#aria-labelledby">`aria-labelledby`</a> attribute the
               <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a> is to be calculated using the algorithm defined in
               <a href="" class="accname">Accessible Name and Description: Computation and API Mappings</a>.
             </li>
             <li>
-              Otherwise use the associated `label` element or elements <a data-cite="accname-1.2/#dfn-accessible-name">accessible name(s)</a> - if more than one `label` is associated; concatenate by
-              DOM order, delimited by spaces.
+              If the <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a> is still empty: 
+              use the <a data-cite="accname-1.2/#mapping_additional_nd_te">text equivalent computation</a> of the associated `label` element's subtree 
+              - if more than one `label` is associated; concatenate their subtrees by DOM order, delimited by spaces.
+              <p>
+                If the control is encapsulated by its `label` element, exclude the control's author specified or 
+                user-entered value from its computed <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a>.
+              </p>
+            </li>
+            <li>
+              If the <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a> is still empty: 
+              use the value of the control's `title` attribute.
+            </li>
+            <li>
+              Otherwise: 
+              use the value of the control's <a href="#att-placeholder">placeholder</a> attribute.
             </li>
-            <li>If the <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a> is still empty, then: use the control's `title` attribute.</li>
-            <li>Otherwise use the control's <a href="#att-placeholder">placeholder</a> value.</li>
             <li>If none of the above yield a usable text string there is no <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a>.</li>
           </ol>
         </section>
         <section>
-          <h4>`input type="button"`, `input type="submit"` and `input type="reset"` Accessible Name Computation</h4>
+          <h4>`input type="button"`, `input type="submit"` and `input type="reset"` Elements Accessible Name Computation</h4>
           <ol>
             <li>
-              If the control has an <a data-cite="wai-aria-1.2/#aria-label">`aria-label`</a> or an <a data-cite="wai-aria-1.2/#aria-labelledby">`aria-labelledby`</a> attribute the
+              If the control has an <a data-cite="wai-aria-1.2/#aria-label">`aria-label`</a> 
+              or an <a data-cite="wai-aria-1.2/#aria-labelledby">`aria-labelledby`</a> attribute the
               <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a> is to be calculated using the algorithm defined in
               <a href="" class="accname">Accessible Name and Description: Computation and API Mappings</a>.
             </li>
             <li>
-              Otherwise use the associated `label` element(s) <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a>(s) - if more than one `label` is associated; concatenate by DOM order,
-              delimited by spaces.
+              If the <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a> is still empty: 
+              use the <a data-cite="accname-1.2/#mapping_additional_nd_te">text equivalent computation</a> of the associated `label` element's subtree 
+              - if more than one `label` is associated; concatenate their subtrees by DOM order, delimited by spaces.
+              <p>
+                If the control is encapsulated by its `label` element, and the control has an author specified `value` or the lack of a `value`
+                has produced an <a href="https://infra.spec.whatwg.org/#implementation-defined">implementation defined</a> string to render, 
+                then exclude either from the control's computed <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a>.
+              </p>
+            </li>
+            <li>
+              If the <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a> is still empty: 
+              use the value of the control's `value` attribute.</li>
+            <li>
+              For `input type=submit` and `type=reset`: 
+              if the <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a> is still empty, and the `value` attribute is unspecified use the
+              <a href="https://infra.spec.whatwg.org/#implementation-defined">implementation defined</a> string respective to the input type. 
+              For instance, a localized string of the word "submit" or "reset" respective to the type of `input`.
             </li>
-            <li>Otherwise use the `value` attribute.</li>
             <li>
-              For `input type=submit` and `type=reset`: if the prior steps do not yield a usable text string, and the `value` attribute is unspecified use the
-              <a href="https://infra.spec.whatwg.org/#implementation-defined">implementation defined</a> string respective to the input type.
+              Otherwise:
+              use the value of the control's `title` attribute.
             </li>
-            <li>Otherwise, if the control still has no <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a> use `title` attribute.</li>
             <li>If none of the above yield a usable text string there is no <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a>.</li>
           </ol>
         </section>
         <section>
-          <h4>`input type="image"` Accessible Name Computation</h4>
+          <h4>`input type="image"` Element Accessible Name Computation</h4>
           <ol>
             <li>
-              If the control has an <a data-cite="wai-aria-1.2/#aria-label">`aria-label`</a> or an <a data-cite="wai-aria-1.2/#aria-labelledby">`aria-labelledby`</a> attribute the
+              If the control has an <a data-cite="wai-aria-1.2/#aria-label">`aria-label`</a> 
+              or an <a data-cite="wai-aria-1.2/#aria-labelledby">`aria-labelledby`</a> attribute the
               <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a> is to be calculated using the algorithm defined in
               <a href="" class="accname">Accessible Name and Description: Computation and API Mappings</a>.
             </li>
             <li>
-              Otherwise use the associated `label` element(s) <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a>(s) - if more than one `label` is associated; concatenate by DOM order,
-              delimited by spaces.
+              If the <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a> is still empty: 
+              use the <a data-cite="accname-1.2/#mapping_additional_nd_te">text equivalent computation</a> of the associated `label` element's subtree 
+              - if more than one `label` is associated; concatenate their subtrees by DOM order, delimited by spaces.
+              <p>
+                If the control is encapsulated by its `label` element, and the control has an `alt` attribute, 
+                then exclude the attribute's value from the control's computed <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a>.
+              </p>
+            </li>
+            <li>
+              If the <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a> is still empty: 
+              use the value of the control's `alt` attribute if present and its value is not the empty string.
             </li>
-            <li>Otherwise use `alt` attribute if present and its value is not the empty string.</li>
-            <!-- NOTE: use of value attribute is invalid on input type=image, but it DOES contribute to the name if used -->
-            <!-- <li>Otherwise use `value` attribute.</li> -->
-            <li>Otherwise use `title` attribute if present and its value is not the empty string.</li>
+            <!-- NOTE: use of value attribute is invalid on input type=image, but it DOES contribute to the name if used.
+                       if this were to be specified, it'd belong here in the steps -->
             <li>
-              Otherwise if the previous steps do not yield a usable text string, use the
-              <a href="https://infra.spec.whatwg.org/#implementation-defined">implementation defined</a> string respective to the input type (an `input` in the `image` state represents a
+              If the <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a> is still empty:
+              use the value of the control's `title` attribute if present and its value is not the empty string.
+            </li>
+            <li>
+              Otherwise, if the previous steps do not yield a usable text string:
+              use the <a href="https://infra.spec.whatwg.org/#implementation-defined">implementation defined</a> string respective to the input type (an `input` in the `image` state represents a
               <a data-cite="html/forms.html#concept-submit-button">submit button</a>). For instance, a localized string of the word "submit" or the words &quot;Submit Query&quot;.
             </li>
             <li>If none of the above yield a usable text string there is no <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a>.</li>
@@ -16118,16 +16156,28 @@ <h4>`input type="image"` Accessible Name Computation</h4>
           <h4>`button` Element Accessible Name Computation</h4>
           <ol>
             <li>
-              If the `button` element has an <a data-cite="wai-aria-1.2/#aria-label">`aria-label`</a> or an <a data-cite="wai-aria-1.2/#aria-labelledby">`aria-labelledby`</a> attribute the
+              If the `button` element has an <a data-cite="wai-aria-1.2/#aria-label">`aria-label`</a> 
+              or an <a data-cite="wai-aria-1.2/#aria-labelledby">`aria-labelledby`</a> attribute the
               <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a> is to be calculated using the algorithm defined in
               <a href="" class="accname">Accessible Name and Description: Computation and API Mappings</a>.
             </li>
             <li>
-              Otherwise use the associated `label` element(s) <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a>(s) - if more than one `label` is associated; concatenate by DOM order,
-              delimited by spaces.
+              If the <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a> is still empty: 
+              use the <a data-cite="accname-1.2/#mapping_additional_nd_te">text equivalent computation</a> of the associated `label` element's subtree 
+              - if more than one `label` is associated; concatenate their subtrees by DOM order, delimited by spaces.
+              <p>
+                If the `button` element is encapsulated by its `label` element, ignore the `button` element's subtree from its computed 
+                <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a>.
+              </p>
+            </li>
+            <li>
+              If the <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a> is still empty:
+              use the <a data-cite="accname-1.2/#mapping_additional_nd_te">text equivalent computation</a> of the element's subtree.
+            </li>
+            <li>
+              Otherwise:
+              use the value of the element's `title` attribute.
             </li>
-            <li>Otherwise use the `button` element subtree.</li>
-            <li>Otherwise use `title` attribute.</li>
             <li>If none of the above yield a usable text string there is no <a data-cite="accname-1.2/#dfn-accessible-name">accessible name</a>.</li>
           </ol>
         </section>