HTML5 Ads Guide

What are HTML5 Ads

HTML5 ads, also known as rich media ads, include advanced features like animations or other elements that encourage viewers to interact and engage with content. These ads are formatted using HTML5 language, which allows developers to add animations directly into the source code of a page.

These types of ads are like mini web pages and contain multiple file types that can combine HTML, Javascript, CSS, Web Fonts, shared javascript libraries, SVG, WebGL, and other standard assets, such as images. This eliminates the need for plugins like Adobe Flash, which is no longer supported by RollWorks or any of its partners.



What sizes are supported for HTML5 Ads

Placement Size
Web Video 0x3
Vertical Banner 120x240
Tiny Rectangle 120x60
Skyscraper 120x600
Square Button 125x125
Wide Skyscraper 160x600
Small Rectangle 180x150
Mid Square 200x200
Square 250x250
3:1 Rectangle 300x100
Inline Rectangle 300x250
Half-Page 300x600
Mobile Leaderboard 320x50
Large Rectangle 336x280
Email Banner 400x80
Email Banner 500x100
Leaderboard 728x90
Billboard 970x250

Mobile ad sizes

Please know that the possibility of showing a certain ad size on mobile depends on the publisher. Some publishers may allow certain sizes on mobile and others don't. The most common mobile ad sizes are 320x50, and 300x250.


HTML5 Ads Specifications

Field Ad Copy Specs
Supported File Types
  • zip
Maximum File Size
  • Limited to 150KB
Zip compression
  • Each HTML5 ad must be its own zip file that contains all code and assets (including public, commonly used JavaScript libraries). It must contain all files referenced from the HTML document:
    • The root of the folder should be a single, well-structured, and complete HTML document
    • The ad must be loadable into an iFrame (when being served).
    • Supported Shared Libraries: Adobe Edge, CreateJS (Easeljs, Movieclip, TweenJS, SoundJS, and PreloadJS), JQuery, Angular JS, Tumult Hype, Swiffy, GSAP (TweenLite, CSSPlugin, and EasePack).
  • Links must reference file locations.
Secure loading
  • Assets must be loaded securely using https.
Not Permitted
  • Code references to external domains are not permitted (no cross-domain scripting).
  • Local storage or session storage libraries are not permitted.
  • CDN calls are not allowed within the creative's HTML file due to security reasons.
Animation Limit
  • The animation limit for an HTML5 ad is 30 seconds. Looping the animation is not allowed.


Technical requirements

  • Use the <!DOCTYPE html><html>, and <body> tags

  • Use the <meta> tags to identify the size of the ad:

    • <meta name="ad.size" content= "width=300, height=250">
  • Declare a clickTag variable. ClickTag is a click-through URL: a shortcut to set the click-through URL in the platform.

    • <script type="text/javascript">
      // Change the value of this string to your URL
      var clickTag = "";
    • This must be passed as a parameter to any event in the ad code.

      <div id="clickArea" style="width: 300px; height: 250px" onclick=" ,'_blank');">


How to create HTML5 ad creatives

We recommend working with a graphic designer who can satisfy the above requirements to create HTML5 ads. Once you have created your HTML5 ad we recommend using this validator tool to validate the asset.

If you have a contract with RollWorks we can assemble HTML5 ads for you, the amount you can request is limited depending on your package. Click here to learn what creative services we offer by package, including HTML5 ad assembly.


How to upload HTML5 ads to RollWorks

You cannot upload HTML5 ads to the RollWorks platform directly. Please contact RollWorks Customer Support via chat or email and we will upload the ads on your behalf.

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