Support HTML5 form attribute

Codeception/Codeception#5477

Author: SamMousa

src/Codeception/Lib/InnerBrowser.php

@@ -447,6 +447,18 @@ private function clickButton(\DOMNode $node)
             $formParams = [$buttonName => $buttonValue];
         }
 
+        if (!empty($node->getAttribute('form'))) {
+            $formCrawler = $this->filterByCSS('#' . $node->getAttribute('form'));
+            if ($formCrawler->count() !== 1) {
+                throw new TestRuntimeException("Found form with id {$node->getAttribute('form')} {$formCrawler->count()} times, expected exactly 1");
+            }
+            $this->proceedSubmitForm(
+                new Crawler($formCrawler->getNode(0), $this->getAbsoluteUrlFor($this->_getCurrentUri()), $this->getBaseUrl()),
+                $formParams
+            );
+            return true;
+        }
+        
         while ($node->parentNode !== null) {
             $node = $node->parentNode;
             if (!isset($node->tagName)) {