diff --git a/app/assets/javascripts/discourse/lib/to-markdown.js.es6 b/app/assets/javascripts/discourse/lib/to-markdown.js.es6
index be280948498..c52b3befbe1 100644
--- a/app/assets/javascripts/discourse/lib/to-markdown.js.es6
+++ b/app/assets/javascripts/discourse/lib/to-markdown.js.es6
@@ -86,6 +86,14 @@ class Tag {
     };
   }
 
+  static keep(name) {
+    return class extends Tag {
+      constructor() {
+        super(name, `<${name}>`, `</${name}>`);
+      }
+    };
+  }
+
   static replace(name, text) {
     return class extends Tag {
       constructor() {
@@ -184,9 +192,10 @@ const tags = [
   ...Tag.emphases().map((e) => Tag.emphasis(e[0], e[1])),
   Tag.cell("td"), Tag.cell("th"),
   Tag.replace("br", "\n"), Tag.replace("hr", "\n---\n"), Tag.replace("head", ""),
+  Tag.keep("ins"), Tag.keep("del"), Tag.keep("small"), Tag.keep("big"),
   Tag.li(), Tag.link(), Tag.image(),
 
-  // TO-DO  CREATE: code, tbody, ins, del, blockquote, small, large
+  // TO-DO  CREATE: code, tbody, blockquote
   //        UPDATE: ol, pre, thead, th, td
 ];
 
diff --git a/test/javascripts/lib/to-markdown-test.js.es6 b/test/javascripts/lib/to-markdown-test.js.es6
index 4a8e0cd8cb4..eb5c7c729fe 100644
--- a/test/javascripts/lib/to-markdown-test.js.es6
+++ b/test/javascripts/lib/to-markdown-test.js.es6
@@ -128,3 +128,23 @@ QUnit.test("converts img tag", assert => {
   html = `<a><img src="${url}" alt="description" /></a>`;
   assert.equal(toMarkdown(html), `![description](${url})`);
 });
+
+QUnit.test("suppring html tags by keeping them", assert => {
+  let html = "Lorem <del>ipsum dolor</del> sit <big>amet, <ins>consectetur</ins></big>";
+  let output = html;
+  assert.equal(toMarkdown(html), output);
+
+  html = `Lorem <del style="font-weight: bold">ipsum dolor</del> sit <big>amet, <ins onclick="alert('hello')">consectetur</ins></big>`;
+  assert.equal(toMarkdown(html), output);
+
+  html = `<a href="http://example.com" onload="">Lorem <del style="font-weight: bold">ipsum dolor</del> sit</a>.`;
+  output = `[Lorem <del>ipsum dolor</del> sit](http://example.com).`;
+  assert.equal(toMarkdown(html), output);
+
+  html = `Lorem <del>ipsum \n\n dolor</del> sit.`;
+  assert.equal(toMarkdown(html), html);
+
+  html = `Lorem <a href="http://example.com"><del>ipsum \n\n\n dolor</del> sit.</a>`;
+  output = `Lorem [<del>ipsum \n dolor</del> sit.](http://example.com)`;
+  assert.equal(toMarkdown(html), output);
+});