Do not generate default alt text in image tags

- Auto-generating content from the filename of an image is not suitable
  alternative text; alt text that isn't fully considered can be
  distracting and fatiguing for screen readers users (blind, low vision,
  dyslexic people).
- Setting a filename fallback short circuits screen reader default
  behavior and configuration for blank descriptions.
- Setting poor defaults also creates false negatives for accessibility
  linting and testing software, that makes it harder to improve
  application accessibility.

***

- After this change, if authors leave images without alt text, screen
  readers will fallback to default behavior for missing alt text.
- Also with this change, Automated linting and testing tools will
  correctly generate warnings.

[Fixes #30096]

1 files changed, 3 insertions, 3 deletions

diff --git a/activestorage/test/template/image_tag_test.rb b/activestorage/test/template/image_tag_test.rb
index 46dd97b3e9..dedc58452e 100644
--- a/activestorage/test/template/image_tag_test.rb
+++ b/activestorage/test/template/image_tag_test.rb
@@ -11,17 +11,17 @@ class ActiveStorage::ImageTagTest < ActionView::TestCase
   end
 
   test "blob" do
-    assert_dom_equal %(<img alt="Racecar" src="#{polymorphic_url @blob}" />), image_tag(@blob)
+    assert_dom_equal %(<img src="#{polymorphic_url @blob}" />), image_tag(@blob)
   end
 
   test "variant" do
     variant = @blob.variant(resize: "100x100")
-    assert_dom_equal %(<img alt="Racecar" src="#{polymorphic_url variant}" />), image_tag(variant)
+    assert_dom_equal %(<img src="#{polymorphic_url variant}" />), image_tag(variant)
   end
 
   test "attachment" do
     attachment = ActiveStorage::Attachment.new(blob: @blob)
-    assert_dom_equal %(<img alt="Racecar" src="#{polymorphic_url attachment}" />), image_tag(attachment)
+    assert_dom_equal %(<img src="#{polymorphic_url attachment}" />), image_tag(attachment)
   end
 
   test "error when attachment's empty" do