* add back delete doc and test page

Author: khiga8

docs/rules/accessibility/avoid-both-disabled-and-aria-disabled.md

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+# Avoid both disabled and aria disabled
+
+## Rule Details
+
+[From w3 ARIA in HTML ](https://www.w3.org/TR/html-aria/#docconformance-attr):
+> authors MAY use aria-disabled=true on a button element, rather than the disabled attribute. However, authors SHOULD NOT use both the native HTML attribute and the aria-* attribute together,
+
+HTML elements with `disabled` are ignored when a screen reader uses tab navigation. To expose the disabled element, one may use `aria-disabled` and custom js and css to mimic disabled behavior *instead*. Setting both `aria-disabled` and `disabled` is unnecessary.
+
+This linter will raise when both `aria-disabled` and `disabled` are set on HTML elements that natively support `disabled` including `button`, `fieldset`, `input`, `optgroup`, `option`, `select`, and `textarea`.
+
+### 👎 Examples of **incorrect** code for this rule:
+
+```erb
+<button aria-disabled="true" disabled="true">
+<input aria-disabled="true" disabled="true">
+```
+
+### 👍 Examples of **correct** code for this rule:
+
+```erb
+<button disabled="true">
+````
+
+```erb
+<input disabled="true">
+```
+
+```erb
+<button aria-disabled="true" class="js-disabled-button disabled-button">Update</button>
+```

test/linters/accessibility/avoid_both_disabled_and_aria_disabled_test.rb

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+# frozen_string_literal: true
+
+require "test_helper"
+
+class AvoidBothDisabledAndAriaDisabled < LinterTestCase
+  def linter_class
+    ERBLint::Linters::GitHub::Accessibility::AvoidBothDisabledAndAriaDisabled
+  end
+
+  ELEMENTS_WITH_NATIVE_DISABLED_ATTRIBUTE_SUPPORT = %w[button fieldset input optgroup option select textarea].freeze
+
+  def test_warns_if_both_disabled_and_aria_disabled_set_on_html_elements_with_disabled_support
+    @file = ELEMENTS_WITH_NATIVE_DISABLED_ATTRIBUTE_SUPPORT.map do |element|
+      "<#{element} aria-disabled='true' disabled> </#{element}>"
+    end.join
+    @linter.run(processed_source)
+
+    assert_equal @linter.offenses.count, 7
+  end
+
+  def test_does_not_warn_if_only_disabled_attribute_is_set
+    @file = ELEMENTS_WITH_NATIVE_DISABLED_ATTRIBUTE_SUPPORT.map do |element|
+      "<#{element} disabled> </#{element}>"
+    end.join
+    @linter.run(processed_source)
+
+    assert_empty @linter.offenses
+  end
+
+  def test_does_not_warn_if_only_aria_disabled_attribute_is_set
+    @file = ELEMENTS_WITH_NATIVE_DISABLED_ATTRIBUTE_SUPPORT.map do |element|
+      "<#{element} aria-disabled='true'> </#{element}>"
+    end.join
+    @linter.run(processed_source)
+
+    assert_empty @linter.offenses
+  end
+end