diff --git a/htdocs/admin/ihm.php b/htdocs/admin/ihm.php
index a29171f79e8..31bbbb5d550 100644
--- a/htdocs/admin/ihm.php
+++ b/htdocs/admin/ihm.php
@@ -63,8 +63,7 @@ if ($action == 'update')
 	dolibarr_set_const($db, "MAIN_DEFAULT_WORKING_DAYS",		$_POST["MAIN_DEFAULT_WORKING_DAYS"],'chaine',0,'',$conf->entity);
 	dolibarr_set_const($db, "MAIN_DEFAULT_WORKING_HOURS",		$_POST["MAIN_DEFAULT_WORKING_HOURS"],'chaine',0,'',$conf->entity);
 	dolibarr_set_const($db, "MAIN_SHOW_LOGO",					$_POST["MAIN_SHOW_LOGO"],'chaine',0,'',$conf->entity);
-	dolibarr_set_const($db, "MAIN_ACTIVATE_HTML5",				$_POST["MAIN_ACTIVATE_HTML5"],'chaine',0,'',$conf->entity);
-    dolibarr_set_const($db, "MAIN_ACTIVATE_FILECACHE",          $_POST["MAIN_ACTIVATE_FILECACHE"],'chaine',0,'',$conf->entity);
+	dolibarr_set_const($db, "MAIN_ACTIVATE_FILECACHE",          $_POST["MAIN_ACTIVATE_FILECACHE"],'chaine',0,'',$conf->entity);
 	dolibarr_set_const($db, "MAIN_FIRSTNAME_NAME_POSITION",		$_POST["MAIN_FIRSTNAME_NAME_POSITION"],'chaine',0,'',$conf->entity);
 
 	dolibarr_set_const($db, "MAIN_THEME",						$_POST["main_theme"],'chaine',0,'',$conf->entity);
@@ -189,17 +188,6 @@ if ($action == 'edit')	// Edit
 	print '<td width="20">&nbsp;</td>';
 	print '</tr>';
 
-	// Activate Html5 - Developement - Only available on Eldy template
-	if ($conf->global->MAIN_FEATURES_LEVEL == 2 || ! empty($conf->global->MAIN_ACTIVATE_HTML5))
-	{
-		$var=!$var;
-		print '<tr '.$bc[$var].'><td width="35%">'.$langs->trans("EnableHtml5").'</td><td>';
-		print $form->selectyesno('MAIN_ACTIVATE_HTML5',$conf->global->MAIN_ACTIVATE_HTML5,1);
-		print '</td>';
-		print '<td width="20">&nbsp;</td>';
-		print '</tr>';
-	}
-
     // Activate FileCache - Developement
     if ($conf->global->MAIN_FEATURES_LEVEL == 2 || ! empty($conf->global->MAIN_ACTIVATE_FILECACHE)) {
         $var=!$var;
@@ -385,15 +373,6 @@ else	// Show
 	print '<td width="20">&nbsp;</td>';
 	print "</tr>";
 
-	// Activate Html5 - Developement - Only available on Eldy template
-	if ($conf->global->MAIN_FEATURES_LEVEL == 2 || ! empty($conf->global->MAIN_ACTIVATE_HTML5))
-    {
-		$var=!$var;
-		print '<tr '.$bc[$var].'><td>'.$langs->trans("EnableHtml5").'</td><td>' . yn($conf->global->MAIN_ACTIVATE_HTML5) . '</td>';
-		print '<td width="20">&nbsp;</td>';
-		print "</tr>";
-	}
-
     // Activate FileCache - Developement
     if ($conf->global->MAIN_FEATURES_LEVEL == 2 || ! empty($conf->global->MAIN_ACTIVATE_FILECACHE)) {
         $var=!$var;
diff --git a/htdocs/langs/en_US/admin.lang b/htdocs/langs/en_US/admin.lang
index 062beed5760..798bf8fed09 100755
--- a/htdocs/langs/en_US/admin.lang
+++ b/htdocs/langs/en_US/admin.lang
@@ -938,7 +938,6 @@ PermanentLeftSearchForm=Permanent search form on left menu
 DefaultLanguage=Default language to use (language code)
 EnableMultilangInterface=Enable multilingual interface
 EnableShowLogo=Show logo on left menu
-EnableHtml5=Enable Html5 (Developement - Only available on Eldy template)
 SystemSuccessfulyUpdated=Your system has been updated successfully
 CompanyInfo=Company/foundation information
 CompanyIds=Company/foundation identities
diff --git a/htdocs/main.inc.php b/htdocs/main.inc.php
index 71dc8df10e5..cb748e2f146 100644
--- a/htdocs/main.inc.php
+++ b/htdocs/main.inc.php
@@ -973,10 +973,9 @@ function top_htmlhead($head, $title='', $disablejs=0, $disablehead=0, $arrayofjs
 		if (GETPOST('dol_basehref')) print '<base href="'.dol_escape_htmltag(GETPOST('dol_basehref')).'">'."\n";
         // Displays meta
         print '<meta name="robots" content="noindex,nofollow">'."\n";      				// Do not index
-        print '<meta name="viewport" content="width=device-width, initial-scale=1">';	// Scale for mobile device
+        print '<meta name="viewport" content="width=device-width, initial-scale=1.0">';	// Scale for mobile device
         print '<meta name="author" content="Dolibarr Development Team">'."\n";
-		if (! empty($conf->global->MAIN_ACTIVATE_HTML5)) print '<meta name="viewport" content="width=device-width, initial-scale=1.0">'."\n";	// Needed for Responsive Web Design
-        $favicon=dol_buildpath('/theme/'.$conf->theme.'/img/favicon.ico',1);
+		$favicon=dol_buildpath('/theme/'.$conf->theme.'/img/favicon.ico',1);
         if (! empty($conf->global->MAIN_FAVICON_URL)) $favicon=$conf->global->MAIN_FAVICON_URL;
         print '<link rel="shortcut icon" type="image/x-icon" href="'.$favicon.'"/>'."\n";
         if (empty($conf->global->MAIN_OPTIMIZEFORTEXTBROWSER)) print '<link rel="top" title="'.$langs->trans("Home").'" href="'.(DOL_URL_ROOT?DOL_URL_ROOT:'/').'">'."\n";