refactor(template-require-iframe-title): remove allowWhitespaceOnlyTitle option

Whitespace-only titles are never intentional and the option added API
surface with no real-world use case. Always flag empty/whitespace title
values as errors.

Author: johanrd

docs/rules/template-require-iframe-title.md

@@ -38,27 +38,6 @@ This rule **forbids** the following:
 </template>
 ```
 
-Whitespace-only `title` (`"   "`) is flagged by default as an
-authoring-hygiene check: HTML and ACCNAME technically permit it (step 2I
-doesn't trim), but a whitespace-only accessible name is useless in
-practice. Suppress this specific strictness via
-`allowWhitespaceOnlyTitle: true` if your codebase needs it.
-
-## Configuration
-
-- `allowWhitespaceOnlyTitle` (`boolean`, default `false`): when `true`,
-  `<iframe title="   ">` is accepted. Empty-string `title=""` and
-  non-string mustache literals (`{{null}}`, `{{undefined}}`, `{{42}}`) are
-  still flagged.
-
-```js
-module.exports = {
-  rules: {
-    'ember/template-require-iframe-title': ['error', { allowWhitespaceOnlyTitle: true }],
-  },
-};
-```
-
 ## References
 
 - [WCAG SC 4.1.2 — Name, Role, Value](https://www.w3.org/TR/UNDERSTANDING-WCAG20/ensure-compat-rsv.html)

lib/rules/template-require-iframe-title.js

@@ -49,17 +49,7 @@ module.exports = {
       templateMode: 'both',
     },
     fixable: null,
-    schema: [
-      {
-        type: 'object',
-        properties: {
-          allowWhitespaceOnlyTitle: {
-            type: 'boolean',
-          },
-        },
-        additionalProperties: false,
-      },
-    ],
+    schema: [],
     messages: {
       // Five messageIds (missingTitle, emptyTitle, invalidTitleLiteral,
       // duplicateTitleFirst, duplicateTitleOther) for richer diagnostic detail.
@@ -79,14 +69,6 @@ module.exports = {
     },
   },
   create(context) {
-    // Whitespace-only `title="   "` is technically spec-compliant: ACCNAME
-    // 1.2 step 2I (Tooltip) does not whitespace-trim like step 2D
-    // (aria-label) does, so a 3-space accessible name is assigned. That is
-    // useless in practice but not a spec violation. Default behavior flags
-    // it as authoring hygiene; set `allowWhitespaceOnlyTitle: true` to
-    // align with spec/peer behavior.
-    const allowWhitespaceOnlyTitle = Boolean(context.options[0]?.allowWhitespaceOnlyTitle);
-
     // Each entry: { value, node, index }
     //  - value: trimmed title string
     //  - node: original element node for the first occurrence
@@ -100,11 +82,7 @@ module.exports = {
     function processStaticTitle(node, raw) {
       const value = raw.trim();
       if (value.length === 0) {
-        // Empty-string title always fails: no accessible name for screen readers.
-        // Whitespace-only titles are controlled by `allowWhitespaceOnlyTitle`.
-        if (raw.length === 0 || !allowWhitespaceOnlyTitle) {
-          context.report({ node, messageId: 'emptyTitle' });
-        }
+        context.report({ node, messageId: 'emptyTitle' });
         return;
       }
       // Duplicate check — reports BOTH the first and the current occurrence

tests/lib/rules/template-require-iframe-title.js

@@ -21,11 +21,6 @@ ruleTester.run('template-require-iframe-title', rule, {
     // literals supply an accessible name the same as a text node.
     '<template><iframe title={{"My frame"}} /></template>',
     '<template><iframe title="foo" /><iframe title="bar" /></template>',
-    // allowWhitespaceOnlyTitle: true — whitespace-only accepted.
-    {
-      code: '<template><iframe title="   " /></template>',
-      options: [{ allowWhitespaceOnlyTitle: true }],
-    },
   ],
   invalid: [
     {
@@ -165,14 +160,6 @@ ruleTester.run('template-require-iframe-title', rule, {
       output: null,
       errors: [{ messageId: 'emptyTitle' }],
     },
-    // Empty-string title is flagged even with allowWhitespaceOnlyTitle: true
-    // (an empty string is not a whitespace string).
-    {
-      code: '<template><iframe title="" /></template>',
-      output: null,
-      options: [{ allowWhitespaceOnlyTitle: true }],
-      errors: [{ messageId: 'emptyTitle' }],
-    },
   ],
 });
 
@@ -191,11 +178,6 @@ hbsRuleTester.run('template-require-iframe-title', rule, {
     '<iframe title="" aria-hidden />',
     '<iframe title="" hidden />',
     '<iframe title="foo" /><iframe title="bar" />',
-    // allowWhitespaceOnlyTitle: true — whitespace-only accepted in HBS too.
-    {
-      code: '<iframe title="   " />',
-      options: [{ allowWhitespaceOnlyTitle: true }],
-    },
   ],
   invalid: [
     {