diff --git a/assets/src/bundles/webapp/readme-rendering.js b/assets/src/bundles/webapp/readme-rendering.js
index 3cb56fae..3d7b9934 100644
--- a/assets/src/bundles/webapp/readme-rendering.js
+++ b/assets/src/bundles/webapp/readme-rendering.js
@@ -1,118 +1,127 @@
 /**
  * Copyright (C) 2018-2021  The Software Heritage developers
  * See the AUTHORS file at the top-level directory of this distribution
  * License: GNU Affero General Public License version 3, or any later version
  * See top-level LICENSE file for more information
  */
 
 import {handleFetchError} from 'utils/functions';
 
 import {decode} from 'html-encoder-decoder';
 
 export async function renderMarkdown(domElt, markdownDocUrl) {
 
   const showdown = await import(/* webpackChunkName: "showdown" */ 'utils/showdown');
   await import(/* webpackChunkName: "highlightjs" */ 'utils/highlightjs');
 
   // Adapted from https://github.com/Bloggify/showdown-highlight
   // Copyright (c) 2016-19 Bloggify <support@bloggify.org> (https://bloggify.org)
   function showdownHighlight() {
     return [{
       type: 'output',
       filter: function(text, converter, options) {
         const left = '<pre><code\\b[^>]*>';
         const right = '</code></pre>';
         const flags = 'g';
         const classAttr = 'class="';
         const replacement = (wholeMatch, match, left, right) => {
           match = decode(match);
           const lang = (left.match(/class="([^ "]+)/) || [])[1];
 
           if (left.includes(classAttr)) {
             const attrIndex = left.indexOf(classAttr) + classAttr.length;
             left = left.slice(0, attrIndex) + 'hljs ' + left.slice(attrIndex);
           } else {
             left = left.slice(0, -1) + ' class="hljs">';
           }
 
           if (lang && hljs.getLanguage(lang)) {
             return left + hljs.highlight(match, {language: lang}).value + right;
           } else {
             return left + match + right;
           }
         };
 
         return showdown.helper.replaceRecursiveRegExp(text, replacement, left, right, flags);
       }
     }];
   }
 
   $(document).ready(async() => {
     const converter = new showdown.Converter({
       tables: true,
       extensions: [showdownHighlight]
     });
+    const url = new URL(window.location.href);
+    if (url.searchParams.has('origin_url')) {
+      try {
+        const originUrl = new URL(url.searchParams.get('origin_url'));
+        if (originUrl.hostname === 'github.com') {
+          converter.setFlavor('github');
+        }
+      } catch (TypeError) {}
+    }
 
     try {
       const response = await fetch(markdownDocUrl);
       handleFetchError(response);
       const data = await response.text();
       $(domElt).addClass('swh-showdown');
       $(domElt).html(swh.webapp.filterXSS(converter.makeHtml(data)));
     } catch (_) {
       $(domElt).text('Readme bytes are not available');
     }
   });
 
 }
 
 export async function renderOrgData(domElt, orgDocData) {
 
   const org = await import(/* webpackChunkName: "org" */ 'utils/org');
 
   const parser = new org.Parser();
   const orgDocument = parser.parse(orgDocData, {toc: false});
   const orgHTMLDocument = orgDocument.convert(org.ConverterHTML, {});
   $(domElt).addClass('swh-org');
   $(domElt).html(swh.webapp.filterXSS(orgHTMLDocument.toString()));
   // remove toc and section numbers to get consistent
   // with other readme renderings
   $('.swh-org ul').first().remove();
   $('.section-number').remove();
 
 }
 
 export function renderOrg(domElt, orgDocUrl) {
   $(document).ready(async() => {
     try {
       const response = await fetch(orgDocUrl);
       handleFetchError(response);
       const data = await response.text();
       renderOrgData(domElt, data);
     } catch (_) {
       $(domElt).text('Readme bytes are not available');
     }
   });
 }
 
 export function renderTxt(domElt, txtDocUrl) {
   $(document).ready(async() => {
     try {
       const response = await fetch(txtDocUrl);
       handleFetchError(response);
       const data = await response.text();
 
       const orgMode = '-*- mode: org -*-';
       if (data.indexOf(orgMode) !== -1) {
         renderOrgData(domElt, data.replace(orgMode, ''));
       } else {
         $(domElt).addClass('swh-readme-txt');
         $(domElt)
             .html('')
             .append($('<pre></pre>').text(data));
       }
     } catch (_) {
       $(domElt).text('Readme bytes are not available');
     }
   });
 }