Issue #2637680 by Dom., mikeocana, laranajim: Submit buttons for GET forms in...

Issue #2637680 by Dom., mikeocana, laranajim: Submit buttons for GET forms in search/views are not W3C valid due to empty 'name' attribute

core/includes/form.inc

@@ -325,6 +325,10 @@ function template_preprocess_vertical_tabs(&$variables) {
  */
 function template_preprocess_input(&$variables) {
   $element = $variables['element'];
+  // Remove name attribute if empty, for W3C compliance.
+  if (isset($variables['attributes']['name']) && empty((string) $variables['attributes']['name'])) {
+    unset($variables['attributes']['name']);
+  }
   $variables['children'] = $element['#children'];
 }
 

core/modules/search/src/Tests/SearchBlockTest.php

@@ -45,6 +45,11 @@ public function testSearchFormBlock() {
     $this->drupalGet('');
     $this->assertText($block->label(), 'Block title was found.');
 
+    // Check that name attribute is not empty.
+    $pattern = "//input[@type='submit' and @name='']";
+    $elements = $this->xpath($pattern);
+    $this->assertTrue(empty($elements), 'The search input field does not have empty name attribute.');
+
     // Test a normal search via the block form, from the front page.
     $terms = array('keys' => 'test');
     $this->submitGetForm('', $terms, t('Search'));