Remove autocapitalize from login input boxes to avoid infringing HTML5 standard when non-Apple browsers

main/auth/gotocourse.php

@@ -27,17 +27,31 @@ if (isset($_GET['firstpage'])) {
     $action = api_get_self().'?'.Security::remove_XSS($_SERVER['QUERY_STRING']);
     $action = str_replace('&', '&', $action);
     $form = new FormValidator('formLogin', 'post', $action, null, array('class'=>'form-stacked'));
+    $params = [
+        'placeholder' => get_lang('UserName')
+    ];
+    // Avoid showing the autocapitalize option if the browser doesn't
+    // support it: this attribute is against the HTML5 standard
+    if (api_browser_support('autocapitalize')) {
+        $params['autocapitalize'] = 'none';
+    }
     $form->addElement(
         'text',
         'login',
         null,
-        array('placeholder' => get_lang('UserName'), 'autocapitalize' => 'none')
+        $params
     );
+    $params = [
+        'placeholder' => get_lang('Password')
+    ];
+    if (api_browser_support('autocapitalize')) {
+        $params['autocapitalize'] = 'none';
+    }
     $form->addElement(
         'password',
         'password',
         null,
-        array('placeholder' => get_lang('Password'), 'autocapitalize' => 'none')
+        $params
     );
     $form->addButtonNext(get_lang('LoginEnter'), 'submitAuth');
     // see same text in main_api.lib.php function api_not_allowed

main/inc/lib/api.lib.php

@@ -3526,15 +3526,19 @@ function api_get_not_allowed_login_form()
         null,
         array('class' => 'form-stacked')
     );
+    $params = [
+        'placeholder' => get_lang('UserName'),
+        'class' => 'col-md-3'
+    ];
+    if (api_browser_support('autocapitalize')) {
+        $params['autocapitalize'] = 'none';
+    }
+
     $form->addElement(
         'text',
         'login',
         null,
-        array(
-            'autocapitalize' => 'none',
-            'placeholder' => get_lang('UserName'),
-            'class' => 'col-md-3'
-        )
+        $params
     );
     $form->addElement(
         'password',
@@ -6356,10 +6360,12 @@ function api_get_template($path_type = 'rel')
 }
 
 /**
- * Check browser support for type files
- * This function check if the users browser support a file format or
- * return the current browser and major ver when $format=check_browser
- * @param string $format
+ * Check browser support for specific file types or features
+ * This function checks if the user's browser supports a file format or given
+ * feature, or returns the current browser and major version when
+ * $format=check_browser. Only a limited number of formats and features are
+ * checked by this method. Make sure you check its definition first.
+ * @param string $format Can be a file format (extension like svg, webm, ...) or a feature (like autocapitalize, ...)
  *
  * @return bool or return text array if $format=check_browser
  * @author Juan Carlos Raña Trabado
@@ -6537,6 +6543,14 @@ function api_browser_support($format = '')
             $result[$format] = false;
             return false;
         }
+    } elseif ($format == 'autocapitalize') {
+        // Help avoiding showing the autocapitalize option if the browser doesn't
+        // support it: this attribute is against the HTML5 standard
+        if ($current_browser == 'Safari' || $current_browser == 'iPhone') {
+            return true;
+        } else {
+            return false;
+        }
     } elseif ($format == "check_browser") {
         $array_check_browser = array($current_browser, $current_majorver);
         return $array_check_browser;

main/inc/lib/template.lib.php

@@ -1444,32 +1444,39 @@ class Template
             null,
             FormValidator::LAYOUT_BOX_NO_LABEL
         );
-
-        $form->addText(
-            'login',
-            get_lang('UserName'),
-            true,
-            array(
+        $params = [
             'id' => 'login',
             'autofocus' => 'autofocus',
             'icon' => 'user fa-fw',
             'placeholder' => get_lang('UserName'),
-                'autocapitalize' => 'none'
-            )
+        ];
+        $browserAutoCapitalize= false;
+        // Avoid showing the autocapitalize option if the browser doesn't
+        // support it: this attribute is against the HTML5 standard
+        if (api_browser_support('autocapitalize')) {
+            $browserAutoCapitalize = false;
+            $params['autocapitalize'] = 'none';
+        }
+        $form->addText(
+            'login',
+            get_lang('UserName'),
+            true,
+            $params
         );
-
+        $params = [
+            'id' => 'password',
+            'icon' => 'lock fa-fw',
+            'placeholder' => get_lang('Pass'),
+        ];
+        if ($browserAutoCapitalize) {
+            $params['autocapitalize'] = 'none';
+        }
         $form->addElement(
             'password',
             'password',
             get_lang('Pass'),
-            array(
-                'id' => 'password',
-                'icon' => 'lock fa-fw',
-                'placeholder' => get_lang('Pass'),
-                'autocapitalize' => 'none',
-            )
+            $params
         );
-
         // Captcha
         $captcha = api_get_setting('allow_captcha');
         $allowCaptcha = $captcha === 'true';