Index: htdocs/modules/contrib/recaptcha/assets/js/recaptcha.invisible.js
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- htdocs/modules/contrib/recaptcha/assets/js/recaptcha.invisible.js	(revision )
+++ htdocs/modules/contrib/recaptcha/assets/js/recaptcha.invisible.js	(revision )
@@ -0,0 +1,34 @@
+var submittedFormId = '';
+
+(function ($, Drupal) {
+
+    Drupal.behaviors.RecaptchaInvisible = {
+
+        request: {},
+
+        attach: function (context, settings) {
+
+
+            $('form').each(function() {
+                var thatForm = this;
+               if ($(this).find('.g-recaptcha[data-size="invisible"]').length === 1) {
+                   $(this).find('input[type="submit"]').click(function(e){
+                       e.preventDefault();
+                       validateInvisibleCaptcha(thatForm);
+                   });
+               }
+            });
+
+            function validateInvisibleCaptcha(thatForm) {
+                submittedFormId = $(thatForm).attr('id');
+                grecaptcha.execute();
+            }
+
+        },
+    };
+
+})(jQuery, Drupal);
+
+function onInvisibleSubmit() {
+    document.getElementById(submittedFormId).submit();
+}
\ No newline at end of file
Index: htdocs/modules/contrib/recaptcha/recaptcha.libraries.yml
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- htdocs/modules/contrib/recaptcha/recaptcha.libraries.yml	(revision )
+++ htdocs/modules/contrib/recaptcha/recaptcha.libraries.yml	(revision )
@@ -0,0 +1,3 @@
+invisible-recaptcha:
+  js:
+    assets/js/recaptcha.invisible.js: {}
\ No newline at end of file
Index: htdocs/modules/contrib/recaptcha/src/ReCaptcha/RequestMethod/Drupal8Post.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- htdocs/modules/contrib/recaptcha/src/ReCaptcha/RequestMethod/Drupal8Post.php	(date 1488792760000)
+++ htdocs/modules/contrib/recaptcha/src/ReCaptcha/RequestMethod/Drupal8Post.php	(revision )
@@ -22,10 +22,10 @@
    * Submit the POST request with the specified parameters.
    *
    * @param RequestParameters $params
-   *   Request parameters.
+   *   Request parameters
    *
    * @return string
-   *   Body of the reCAPTCHA response.
+   *   Body of the reCAPTCHA response
    */
   public function submit(RequestParameters $params) {
 
Index: htdocs/modules/contrib/recaptcha/src/Form/ReCaptchaAdminSettingsForm.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- htdocs/modules/contrib/recaptcha/src/Form/ReCaptchaAdminSettingsForm.php	(date 1488792760000)
+++ htdocs/modules/contrib/recaptcha/src/Form/ReCaptchaAdminSettingsForm.php	(revision )
@@ -65,8 +65,8 @@
       '#default_value' => $config->get('widget.theme'),
       '#description' => $this->t('Defines which theme to use for reCAPTCHA.'),
       '#options' => [
-        'light' => $this->t('Light (default)'),
-        'dark' => $this->t('Dark'),
+        'light' => t('Light (default)'),
+        'dark' => t('Dark'),
       ],
       '#title' => $this->t('Theme'),
       '#type' => 'select',
@@ -87,6 +87,7 @@
       '#options' => [
         '' => $this->t('Normal (default)'),
         'compact' => $this->t('Compact'),
+        'invisible' => $this->t('Invisible'),
       ],
       '#title' => $this->t('Size'),
       '#type' => 'select',
Index: htdocs/modules/contrib/recaptcha/recaptcha.module
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- htdocs/modules/contrib/recaptcha/recaptcha.module	(date 1488792760000)
+++ htdocs/modules/contrib/recaptcha/recaptcha.module	(revision )
@@ -78,6 +78,8 @@
             $noscript = $renderer->render($recaptcha_widget_noscript);
           }
 
+          $invisible = $config->get('widget.size') == 'invisible';
+
           $attributes = [
             'class' => 'g-recaptcha',
             'data-sitekey' => $recaptcha_site_key,
@@ -86,6 +88,10 @@
             'data-size' => $config->get('widget.size'),
             'data-tabindex' => $config->get('widget.tabindex'),
           ];
+
+          if($invisible) $attributes['data-callback'] = 'onInvisibleSubmit';
+          if($invisible) $attributes['data-badge'] = 'inline';
+
           // Filter out empty tabindex/size.
           $attributes = array_filter($attributes);
 
@@ -108,6 +114,10 @@
               ],
             ],
           ];
+
+          if ($invisible) {
+            $captcha['form']['#attached']['library'][] = 'recaptcha/invisible-recaptcha';
+          }
         }
         else {
           // Fallback to Math captcha as reCAPTCHA is not configured.
Index: htdocs/modules/contrib/recaptcha/composer.json
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- htdocs/modules/contrib/recaptcha/composer.json	(date 1488792760000)
+++ htdocs/modules/contrib/recaptcha/composer.json	(revision )
@@ -19,6 +19,6 @@
   },
   "license": "GPL-2.0+",
   "require": {
-    "drupal/captcha": "^1.0.0-alpha1"
+    "drupal/captcha": "~8.0"
   }
 }