diff --git a/demo-mjml.html b/demo-mjml.html
index 4f61a0ce1..3b04554f3 100644
--- a/demo-mjml.html
+++ b/demo-mjml.html
@@ -53,7 +53,7 @@
         </mj-section>
 
         <!-- Image Header -->
-        <mj-section background-url="http://1.bp.blogspot.com/-TPrfhxbYpDY/Uh3Refzk02I/AAAAAAAALw8/5sUJ0UUGYuw/s1600/New+York+in+The+1960's+-+70's+(2).jpg" background-size="cover" background-repeat="no-repeat">
+        <mj-section background-url="//1.bp.blogspot.com/-TPrfhxbYpDY/Uh3Refzk02I/AAAAAAAALw8/5sUJ0UUGYuw/s1600/New+York+in+The+1960's+-+70's+(2).jpg" background-size="cover" background-repeat="no-repeat">
           <mj-column>
             <mj-text align="center" color="#fff" font-size="40" font-family="Helvetica Neue">Slogan here</mj-text>
             <mj-button background-color="#F63A4D" href="#">
@@ -92,13 +92,13 @@
         <!-- Icons -->
         <mj-section background-color="#fbfbfb">
           <mj-column>
-            <mj-image width="100" src="http://191n.mj.am/img/191n/3s/x0l.png" />
+            <mj-image width="100" src="//191n.mj.am/img/191n/3s/x0l.png" />
           </mj-column>
           <mj-column>
-            <mj-image width="100" src="http://191n.mj.am/img/191n/3s/x01.png" />
+            <mj-image width="100" src="//191n.mj.am/img/191n/3s/x01.png" />
           </mj-column>
           <mj-column>
-            <mj-image width="100" src="http://191n.mj.am/img/191n/3s/x0s.png" />
+            <mj-image width="100" src="//191n.mj.am/img/191n/3s/x0s.png" />
           </mj-column>
         </mj-section>
 
@@ -117,11 +117,11 @@
 
     <div id="info-panel" style="display:none">
       <br/>
-      <svg class="info-panel-logo" xmlns="http://www.w3.org/2000/svg" version="1"><g id="gjs-logo"><path d="M40 5l-12.9 7.4 -12.9 7.4c-1.4 0.8-2.7 2.3-3.7 3.9 -0.9 1.6-1.5 3.5-1.5 5.1v14.9 14.9c0 1.7 0.6 3.5 1.5 5.1 0.9 1.6 2.2 3.1 3.7 3.9l12.9 7.4 12.9 7.4c1.4 0.8 3.3 1.2 5.2 1.2 1.9 0 3.8-0.4 5.2-1.2l12.9-7.4 12.9-7.4c1.4-0.8 2.7-2.2 3.7-3.9 0.9-1.6 1.5-3.5 1.5-5.1v-14.9 -12.7c0-4.6-3.8-6-6.8-4.2l-28 16.2" style="fill:none;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-width:10;stroke:#fff"/></g></svg>
+      <svg class="info-panel-logo" xmlns="//www.w3.org/2000/svg" version="1"><g id="gjs-logo"><path d="M40 5l-12.9 7.4 -12.9 7.4c-1.4 0.8-2.7 2.3-3.7 3.9 -0.9 1.6-1.5 3.5-1.5 5.1v14.9 14.9c0 1.7 0.6 3.5 1.5 5.1 0.9 1.6 2.2 3.1 3.7 3.9l12.9 7.4 12.9 7.4c1.4 0.8 3.3 1.2 5.2 1.2 1.9 0 3.8-0.4 5.2-1.2l12.9-7.4 12.9-7.4c1.4-0.8 2.7-2.2 3.7-3.9 0.9-1.6 1.5-3.5 1.5-5.1v-14.9 -12.7c0-4.6-3.8-6-6.8-4.2l-28 16.2" style="fill:none;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-width:10;stroke:#fff"/></g></svg>
       <br/>
       <div class="info-panel-label">
         <b>GrapesJS MJML Newsletter Builder</b> was made not only to show what is possible to achive with the
-        <a class="info-panel-link gjs-four-color" target="_blank" href="http://artf.github.io/grapesjs/">GrapesJS</a>
+        <a class="info-panel-link gjs-four-color" target="_blank" href="//artf.github.io/grapesjs/">GrapesJS</a>
         core library, but also to help non-tech people build responsive cross-platform newsletters using the amazing
         <a class="info-panel-link gjs-four-color" target="_blank" href="https://mjml.io">MJML</a> markup language
         <br/><br/>
@@ -151,7 +151,7 @@
       CKEDITOR.dtd.$editable.a = 1;
 
       var lp = './img/';
-      var plp = 'http://placehold.it/350x250/';
+      var plp = '//placehold.it/350x250/';
       var images = [
         plp+'78c5d6/fff/image1.jpg', plp+'459ba8/fff/image2.jpg', plp+'79c267/fff/image3.jpg',
         plp+'c5d647/fff/image4.jpg', plp+'f28c33/fff/image5.jpg', plp+'e868a2/fff/image6.jpg', plp+'cc4360/fff/image7.jpg',
diff --git a/demo-newsletter-editor.html b/demo-newsletter-editor.html
index 586963533..8f1d50237 100644
--- a/demo-newsletter-editor.html
+++ b/demo-newsletter-editor.html
@@ -60,7 +60,7 @@
             <table class="c1766">
               <tr>
                 <td class="cell c1769">
-                  <img class="c926" src="http://artf.github.io/grapesjs/img/grapesjs-logo.png" alt="GrapesJS."/>
+                  <img class="c926" src="//artf.github.io/grapesjs/img/grapesjs-logo.png" alt="GrapesJS."/>
                 </td>
                 <td class="cell c1776">
                   <div class="c1144">GrapesJS Newsletter Builder
@@ -72,7 +72,7 @@
             <table class="card">
               <tr>
                 <td class="card-cell">
-                  <img class="c1271" src="http://artf.github.io/grapesjs/img/tmp-header-txt.jpg" alt="Big image here"/>
+                  <img class="c1271" src="//artf.github.io/grapesjs/img/tmp-header-txt.jpg" alt="Big image here"/>
                   <table class="table100 c1357">
                     <tr>
                       <td class="card-content">
@@ -101,7 +101,7 @@
                   <table class="list-item-content">
                     <tr class="list-item-row">
                       <td class="list-cell-left">
-                        <img class="list-item-image" src="http://artf.github.io/grapesjs/img/tmp-blocks.jpg" alt="Image1"/>
+                        <img class="list-item-image" src="//artf.github.io/grapesjs/img/tmp-blocks.jpg" alt="Image1"/>
                       </td>
                       <td class="list-cell-right">
                         <h1 class="card-title">Built-in Blocks
@@ -120,7 +120,7 @@
                   <table class="list-item-content">
                     <tr class="list-item-row">
                       <td class="list-cell-left">
-                        <img class="list-item-image" src="http://artf.github.io/grapesjs/img/tmp-tgl-images.jpg" alt="Image2"/>
+                        <img class="list-item-image" src="//artf.github.io/grapesjs/img/tmp-tgl-images.jpg" alt="Image2"/>
                       </td>
                       <td class="list-cell-right">
                         <h1 class="card-title">Toggle images
@@ -139,7 +139,7 @@
                   <table class="grid-item-card">
                     <tr>
                       <td class="grid-item-card-cell">
-                        <img class="grid-item-image" src="http://artf.github.io/grapesjs/img/tmp-send-test.jpg" alt="Image1"/>
+                        <img class="grid-item-image" src="//artf.github.io/grapesjs/img/tmp-send-test.jpg" alt="Image1"/>
                         <table class="grid-item-card-body">
                           <tr>
                             <td class="grid-item-card-content">
@@ -158,7 +158,7 @@
                   <table class="grid-item-card">
                     <tr>
                       <td class="grid-item-card-cell">
-                        <img class="grid-item-image" src="http://artf.github.io/grapesjs/img/tmp-devices.jpg" alt="Image2"/>
+                        <img class="grid-item-image" src="//artf.github.io/grapesjs/img/tmp-devices.jpg" alt="Image2"/>
                         <table class="grid-item-card-body">
                           <tr>
                             <td class="grid-item-card-content">
@@ -465,7 +465,7 @@
 
 
 
-    <form id="test-form" class="test-form" action="http://grapes.16mb.com/s" method="POST" style="display:none">
+    <form id="test-form" class="test-form" action="//grapes.16mb.com/s" method="POST" style="display:none">
       <div class="putsmail-c">
         <a href="https://putsmail.com/" target="_blank">
           <img src="./img/putsmail.png" style="opacity:0.85;" />
@@ -499,11 +499,11 @@
 
     <div id="info-panel" style="display:none">
       <br/>
-      <svg class="info-panel-logo" xmlns="http://www.w3.org/2000/svg" version="1"><g id="gjs-logo"><path d="M40 5l-12.9 7.4 -12.9 7.4c-1.4 0.8-2.7 2.3-3.7 3.9 -0.9 1.6-1.5 3.5-1.5 5.1v14.9 14.9c0 1.7 0.6 3.5 1.5 5.1 0.9 1.6 2.2 3.1 3.7 3.9l12.9 7.4 12.9 7.4c1.4 0.8 3.3 1.2 5.2 1.2 1.9 0 3.8-0.4 5.2-1.2l12.9-7.4 12.9-7.4c1.4-0.8 2.7-2.2 3.7-3.9 0.9-1.6 1.5-3.5 1.5-5.1v-14.9 -12.7c0-4.6-3.8-6-6.8-4.2l-28 16.2" style="fill:none;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-width:10;stroke:#fff"/></g></svg>
+      <svg class="info-panel-logo" xmlns="//www.w3.org/2000/svg" version="1"><g id="gjs-logo"><path d="M40 5l-12.9 7.4 -12.9 7.4c-1.4 0.8-2.7 2.3-3.7 3.9 -0.9 1.6-1.5 3.5-1.5 5.1v14.9 14.9c0 1.7 0.6 3.5 1.5 5.1 0.9 1.6 2.2 3.1 3.7 3.9l12.9 7.4 12.9 7.4c1.4 0.8 3.3 1.2 5.2 1.2 1.9 0 3.8-0.4 5.2-1.2l12.9-7.4 12.9-7.4c1.4-0.8 2.7-2.2 3.7-3.9 0.9-1.6 1.5-3.5 1.5-5.1v-14.9 -12.7c0-4.6-3.8-6-6.8-4.2l-28 16.2" style="fill:none;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-width:10;stroke:#fff"/></g></svg>
       <br/>
       <div class="info-panel-label">
         <b>GrapesJS Newsletter Builder</b> is a showcase of what/how is possible to build an editor using the
-        <a class="info-panel-link gjs-four-color" target="_blank" href="http://artf.github.io/grapesjs/">GrapesJS</a>
+        <a class="info-panel-link gjs-four-color" target="_blank" href="//artf.github.io/grapesjs/">GrapesJS</a>
         core library
         <br/><br/>
         For any tip about this demo (or newsletters construction in general) check the
@@ -531,7 +531,7 @@
 
 
     <script type="text/javascript">
-      var host = 'http://artf.github.io/grapesjs/';
+      var host = '//artf.github.io/grapesjs/';
       var images = [
         host + 'img/grapesjs-logo.png',
         host + 'img/tmp-blocks.jpg',
diff --git a/demo.html b/demo.html
index 0fd06ea70..d8246f330 100644
--- a/demo.html
+++ b/demo.html
@@ -376,7 +376,7 @@
           color: #ffffff;
           font-family: Helvetica, serif;
           font-weight: 100;
-          background-image:url("http://grapesjs.com/img/bg-gr-v.png"), url("http://grapesjs.com/img/work-desk.jpg");
+          background-image:url("//grapesjs.com/img/bg-gr-v.png"), url("//grapesjs.com/img/work-desk.jpg");
           background-attachment:scroll, scroll;
           background-position:left top, center center;
           background-repeat:repeat-y, no-repeat;
@@ -492,24 +492,24 @@
         }
         .card-header{
           height: 155px;
-          background-image:url("http://placehold.it/350x250/78c5d6/fff/image1.jpg");
+          background-image:url("//placehold.it/350x250/78c5d6/fff/image1.jpg");
           background-size:cover;
           background-position:center center;
         }
         .card-header.ch2{
-          background-image:url("http://placehold.it/350x250/459ba8/fff/image2.jpg");
+          background-image:url("//placehold.it/350x250/459ba8/fff/image2.jpg");
         }
         .card-header.ch3{
-          background-image:url("http://placehold.it/350x250/79c267/fff/image3.jpg");
+          background-image:url("//placehold.it/350x250/79c267/fff/image3.jpg");
         }
         .card-header.ch4{
-          background-image:url("http://placehold.it/350x250/c5d647/fff/image4.jpg");
+          background-image:url("//placehold.it/350x250/c5d647/fff/image4.jpg");
         }
         .card-header.ch5{
-          background-image:url("http://placehold.it/350x250/f28c33/fff/image5.jpg");
+          background-image:url("//placehold.it/350x250/f28c33/fff/image5.jpg");
         }
         .card-header.ch6{
-          background-image:url("http://placehold.it/350x250/e868a2/fff/image6.jpg");
+          background-image:url("//placehold.it/350x250/e868a2/fff/image6.jpg");
         }
         .card-body{
           padding: 15px 15px 5px 15px;
@@ -856,7 +856,7 @@
         }
         .badge-header{
           height: 115px;
-          background-image:url("http://grapesjs.com/img/bg-gr-v.png"), url("http://grapesjs.com/img/work-desk.jpg");
+          background-image:url("//grapesjs.com/img/bg-gr-v.png"), url("//grapesjs.com/img/work-desk.jpg");
           background-position:left top, center center;
           background-attachment:scroll, fixed;
           overflow: hidden;
@@ -936,7 +936,7 @@
 
     <div id="info-panel" style="display:none">
       <br/>
-      <svg class="info-panel-logo" xmlns="http://www.w3.org/2000/svg" version="1"><g id="gjs-logo">
+      <svg class="info-panel-logo" xmlns="//www.w3.org/2000/svg" version="1"><g id="gjs-logo">
         <path d="M40 5l-12.9 7.4 -12.9 7.4c-1.4 0.8-2.7 2.3-3.7 3.9 -0.9 1.6-1.5 3.5-1.5 5.1v14.9 14.9c0 1.7 0.6 3.5 1.5 5.1 0.9 1.6 2.2 3.1 3.7 3.9l12.9 7.4 12.9 7.4c1.4 0.8 3.3 1.2 5.2 1.2 1.9 0 3.8-0.4 5.2-1.2l12.9-7.4 12.9-7.4c1.4-0.8 2.7-2.2 3.7-3.9 0.9-1.6 1.5-3.5 1.5-5.1v-14.9 -12.7c0-4.6-3.8-6-6.8-4.2l-28 16.2" style="fill:none;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10;stroke-width:10;stroke:#fff"/>
       </g></svg>
       <br/>
@@ -958,7 +958,7 @@
 
     <script type="text/javascript">
       var lp = './img/';
-      var plp = 'http://placehold.it/350x250/';
+      var plp = '//placehold.it/350x250/';
       var images = [
         lp+'team1.jpg', lp+'team2.jpg', lp+'team3.jpg', plp+'78c5d6/fff/image1.jpg', plp+'459ba8/fff/image2.jpg', plp+'79c267/fff/image3.jpg',
         plp+'c5d647/fff/image4.jpg', plp+'f28c33/fff/image5.jpg', plp+'e868a2/fff/image6.jpg', plp+'cc4360/fff/image7.jpg',