New fork because the old project is abandoned;
The URLs are now (htmlpreview -> html-preview):

  • https://html-preview.github.io/
  • https://html-preview.github.io/?url=https://github.com/bartaz/impress.js/blob/master/index.html

previously:

The most comfortable way to preview HTML files on GitHub is to go to https://htmlpreview.github.io/ or just prepend it to the original URL, i.e.: https://htmlpreview.github.io/?https://github.com/bartaz/impress.js/blob/master/index.html

Answer from niutech on Stack Overflow
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GitHub
github.com › topics › html-css-js-viewer
html-css-js-viewer · GitHub Topics · GitHub
react clone codepen layout-switcher live-preview code-sandbox dark-mode-toggle codepen-clone reset-values html-css-js-viewer
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Markhillard
markhillard.github.io › Editor
Editor ~ Real-time, responsive HTML/CSS/JS code editor
Editor is a responsive HTML/CSS/JS code editor that renders what you type in real-time.
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GitHub
github.com › tomhodgins › liveeditor
GitHub - tomhodgins/liveeditor: A simple live HTML, CSS, and JavaScript scratchpad in your browser
Live Editor is an simple in-browser HTML editor that allows you to write HTML, CSS, and JavaScript in realtime and preview the results on the same page.
Starred by 95 users
Forked by 35 users
Languages   HTML 40.7% | CSS 30.3% | JavaScript 29.0%
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GitHub
github.com › box › viewer.js
viewer.js/ at master · box/viewer.js
Many source code formats will be converted to HTML for use with viewer.js such that you can enable syntax highlighting. To enable syntax highlighting, simply include a Pygments-compatible CSS stylesheet in the page with your viewer.
Author   box
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GitHub
github.com › topics › html-viewer
html-viewer · GitHub Topics · GitHub
A simple web-based HTML viewer that allows users to navigate and display various HTML pages dynamically, with a built-in dark mode toggle. ... A lightweight, single-file PHP application that provides instant HTML file hosting with full CSS and ...
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GitHub
github.com › aKutluozen › Instant-HTML-CSS-Viewer
GitHub - aKutluozen/Instant-HTML-CSS-Viewer: AngularJS based instant HTML and CSS viewer
AngularJS based instant HTML and CSS viewer. Contribute to aKutluozen/Instant-HTML-CSS-Viewer development by creating an account on GitHub.
Author   aKutluozen
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GitHub
github.com › orchardlab › ol-html-viewer
GitHub - orchardlab/ol-html-viewer: Simple web component to view html
<!-- Critical styles to solve "Flash of Unstyled Content" or FOUC --> <link rel="stylesheet" href="https://cdn.jsdelivr.net/gh/orchardlab/[email protected]/styles.css" type="text/css" /> <!-- Register ol-html-viewer --> <script type="module"> import { HTMLViewer } from "https://cdn.jsdelivr.net/gh/orchardlab/[email protected]/html-viewer.js"; customElements.define("ol-html-viewer", HTMLViewer); </script> Using it in your HTML by passing HTML string to <div slot="content">YOUR-ESCAPED-HTML-STRING</div>: <ol-html-viewer> <div slot="content"> &lt;h2&gt;This is a sample HTML content&lt;/h2
Author   orchardlab
Find elsewhere
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GitHub
github.com › htmlpreview › htmlpreview.github.com
GitHub - htmlpreview/htmlpreview.github.com: HTML Preview for GitHub Repositories
HTML Preview for GitHub Repositories. Contribute to htmlpreview/htmlpreview.github.com development by creating an account on GitHub.
Starred by 1.7K users
Forked by 418 users
Languages   JavaScript 78.6% | HTML 21.4%
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GitHub
github.com › documentcloud › document-viewer › blob › master › viewer.html
document-viewer/viewer.html at master · documentcloud/document-viewer
<html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> · <title>Document Viewer (Debug)</title> · <link href="dist/viewer-datauri.css" media="screen" rel="stylesheet" type="text/css"> <link href="public/stylesheets/DV/print.css" media="print" rel="stylesheet" type="text/css"> <script src="dist/viewer.js" type="text/javascript"></script> <script src="dist/templates.js" type="text/javascript"></script> ·
Author   documentcloud
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Chrome Web Store
chromewebstore.google.com › detail › pmpjligbgooljdpakhophgddmcipglna
Github Html Preview - Chrome Web Store
Preview HTML, CSS, and JS code from ChatGPT with Tailwind CSS support. ... Average rating 4.8 out of 5 stars. Learn more about results and reviews. See Lines Of Code of any GitHub repository in simple yet elegant way
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GitHub
github.com › csf30816 › HTML-CSS-Viewer
GitHub - csf30816/HTML-CSS-Viewer
Contribute to csf30816/HTML-CSS-Viewer development by creating an account on GitHub.
Author   csf30816
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GitHub
github.com › webodf › ViewerJS
GitHub - webodf/ViewerJS: ViewerJS: Document Reader in JavaScript
The heavy lifting in ViewerJS is done by these awesome projects: WebODF is a JavaScript library created by KO GmbH. It was started by Jos van den Oever at KO and is now developed by a growing team including external collaborators. It makes it easy to add Open Document Format (ODF) support to your website and to your mobile or desktop applications. It uses HTML and CSS to display ODF documents. PDF.js ...
Starred by 2K users
Forked by 418 users
Languages   JavaScript 50.7% | CSS 25.8% | HTML 12.6% | CMake 10.9%
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Htmlpreview
htmlpreview.github.io
GitHub & BitBucket HTML Preview
Enter URL of the HTML file to preview: · or prepend to the URL: http://htmlpreview.github.io/?https://github.com/twbs/bootstrap/blob/gh-pages/2.3.2/index.html
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Beautifier
beautifier.io
Online JavaScript beautifier
Chrome, in case the built-in CSS and javascript formatting isn't enough for you: — Quick source viewer by Tomi Mickelsson (github, blog), — Javascript and CSS Code beautifier by c7sky, — jsbeautify-for-chrome by Tom Rix (github), — Pretty Beautiful JavaScript by Will McSweeney — Stackoverflow Code Beautify by Making Odd Edit Studios (github). Firefox: Javascript deminifier by Ben Murphy, to be used together with the firebug (github), ... Sublime Text 2/3: CodeFormatter, a python plugin by Avtandil Kikabidze, supports HTML, CSS, JS and a bunch of other languages,
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Codi
codi.link
codi.link | HTML, CSS, JavaScript Live Editor Playground
codi.link is a live editor for HTML, CSS and JS. Edit your code in real-time, and see the result instantly
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GitHub
github.com › Szboy › HtmlViewer
GitHub - Szboy/HtmlViewer: A html viewer made with basic js!
A html viewer made with basic js! Contribute to Szboy/HtmlViewer development by creating an account on GitHub.
Author   Szboy
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Liveweave
liveweave.com
HTML, CSS and JavaScript playground - Liveweave
Vis JS · WWater CSS · download Download expand_more · developer_mode Download as HTML · folder_zip Download as .ZIP · cloud_upload Save · account_circle Login · settings Settings expand_more · 14px · Live mode · Night mode · Line number · Mini map · Word wrap ·
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GitHub
gist.github.com › ruven › 43ebbc0b3c1342a43adb8f24b255e775
viewer.html · GitHub
Clone this repository at &lt;script src=&quot;https://gist.github.com/ruven/43ebbc0b3c1342a43adb8f24b255e775.js&quot;&gt;&lt;/script&gt; Save ruven/43ebbc0b3c1342a43adb8f24b255e775 to your computer and use it in GitHub Desktop. Download ZIP · Raw · viewer.html ·
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GitHub
github.com › fengyuanchen › viewerjs
GitHub - fengyuanchen/viewerjs: JavaScript image viewer.
The cdnjs provides CDN support for Viewer.js's CSS and JavaScript.
Starred by 8.2K users
Forked by 1.2K users
Languages   JavaScript 93.7% | SCSS 3.2% | CSS 3.0% | Shell 0.1%