Kärkimedia

HTML5 rules for Kärkimedia. Requirements depend on the ad server that serves each format.

Some of this publisher's rules are still being verified. Rules marked Not verified can't fail a file.

Formats

Format	Sizes	Weight limit	Accepted	Evidence
Parade	980 × 400, 300 × 300	200 kB · initial load	jpg, png, html5, third-party-tag	AOfficial requirement. Evidence details Source Cross-screen display, material guidelines How verified Read directly Verified 15 Oct 2026 Image 200 kb (980x400) / 100 kb (300x300); HTML5 initial 200 kb. Open source ↗
Vertical parade	300 × 600	200 kB · initial load	jpg, png, html5, third-party-tag	AOfficial requirement. Evidence details Source Cross-screen display, material guidelines How verified Read directly Verified 15 Oct 2026 Image 100 kb; HTML5 initial 200 kb. Open source ↗
Parade + vertical parade	980 × 400, 300 × 600	200 kB · initial load	jpg, png, html5, third-party-tag	AOfficial requirement. Evidence details Source Cross-screen display, material guidelines How verified Read directly Verified 15 Oct 2026 Images 200/100 kb; HTML5 initial 200 kb. Open source ↗
Maxi banner + vertical parade	980 × 552, 300 × 600	200 kB · initial load	jpg, png, html5, third-party-tag	AOfficial requirement. Evidence details Source Cross-screen display, material guidelines How verified Read directly Verified 15 Oct 2026 Images 200/100 kb; HTML5 initial 200 kb. Open source ↗
Giant box	468 × 400, 300 × 300	200 kB · initial load	jpg, png, html5, third-party-tag	AOfficial requirement. Evidence details Source Cross-screen display, material guidelines How verified Read directly Verified 15 Oct 2026 Image 100 kb; HTML5 initial 200 kb. Open source ↗
Box	300 × 250	200 kB · initial load	jpg, png, html5, third-party-tag	AOfficial requirement. Evidence details Source Cross-screen display, material guidelines How verified Read directly Verified 15 Oct 2026 Image 100 kb; HTML5 initial 200 kb. Open source ↗

Delivery methods

Google Ad Manager · AcceptedHTML5 for GAM: clickTag in <head>, link in body via javascript:void(window.open(clickTag)).
AOfficial requirement. Evidence details
Source
Cross-screen display, material guidelines
How verified
Read directly
Verified
15 Oct 2026
HTML5 for GAM: clickTag in <head>, link in body via javascript:void(window.open(clickTag)).
Open source ↗
Equativ (formerly Smart AdServer) · AcceptedHTML5 for Equativ: sas-clicktag-3.1.js in <head>, clickTag script in <body>.
AOfficial requirement. Evidence details
Source
Cross-screen display, material guidelines
How verified
Read directly
Verified
15 Oct 2026
HTML5 for Equativ: sas-clicktag-3.1.js in <head>, clickTag script in <body>.
Open source ↗
Xandr · AcceptedXandr for Aamulehti, Satakunnan Kansa Länsi-Suomi and Helsingin Sanomat, with Sanoma's ClicksApi.js.
AOfficial requirement. Evidence details
Source
Cross-screen display, material guidelines
How verified
Read directly
Verified
15 Oct 2026
Xandr for Aamulehti, Satakunnan Kansa Länsi-Suomi and Helsingin Sanomat, with Sanoma's ClicksApi.js.
Open source ↗
Conflict
Third-party tag · AcceptedDesktop material behind a tag must be in iframe format.
AOfficial requirement. Evidence details
Source
Cross-screen display, material guidelines
How verified
Read directly
Verified
15 Oct 2026
Desktop material behind a tag must be in iframe format.
Open source ↗

Click implementation

Google Ad Manager clickTag

Click variable

clickTag · more areas: clickTag2, clickTag3 · case-sensitive

AOfficial requirement

Source: Ad Manager API: CreativeService.ClickTag (v202511) · HTML5 guidelines for Ad Manager
How verified: Read directly
Verified: 15 Oct 2026

API: click tag names follow the regex clickTag\d*.

Open source ↗

Conflict

Declared in

head

<head>
   <meta name="ad.size" content="width=300,height=250">
   <script type="text/javascript">
      var clickTag = "http://www.google.com";
   </script>
</head>

AOfficial requirement

Source: HTML5 guidelines for Ad Manager
How verified: Read directly
Verified: 15 Oct 2026

Insert click tags in the <head>; no minification or obfuscation of click tags (minify the rest if you like).

Open source ↗

Minimum click tags

AOfficial requirement

Source: Traffic HTML5 creatives (Ad Manager)
How verified: Read directly
Verified: 15 Oct 2026

At least one standard click tag.

Open source ↗

Code pattern

<a href="javascript:void(window.open(clickTag))">

AOfficial requirement

Source: HTML5 guidelines for Ad Manager
How verified: Read directly
Verified: 15 Oct 2026

Use the clickTag variable as the destination.

Open source ↗

Hard-coded landing URLs

Not allowed

AOfficial requirement

Source: HTML5 guidelines for Ad Manager
How verified: Read directly
Verified: 15 Oct 2026

Hard-coded URLs prevent click tracking and URL updates; Ad Manager warns on upload.

Open source ↗

Precedence

Ad-level click-through settings override creative click tags; URLs can be changed after upload

AOfficial requirement

Source: HTML5 guidelines for Ad Manager
How verified: Read directly
Verified: 15 Oct 2026

Precedence.

Open source ↗

Equativ click counting library (hosted insertions)

Required library

//ns.sascdn.com/diff/templates/js/banner/sas-clicktag-3.1.js · head of index.html

AOfficial requirement

Source: Manage click counting
How verified: Read directly
Verified: 15 Oct 2026

Add the click counting library to the <head> of the main index.html.

Open source ↗

Click variable

clickTag · more areas: clickTag0, clickTag1, clickTag2

AOfficial requirement

Source: Manage click counting
How verified: Read directly
Verified: 15 Oct 2026

Single: var clickTag (optional; var clickTag="" if unused). Multiple: clickTag0, clickTag1, clickTag2 ...; numbering must begin with clickTag0, otherwise clicks are not counted properly.

Open source ↗

Code pattern

method 1 (not rendered in the page text) | method 2: assign href after sas.clicktag.register(init) completes  |  example: clickArea.onclick = function(){ window.open(clickTag, "blank"); }

AOfficial requirement

Source: Manage click counting · Cross-screen display, material guidelines
How verified: Read directly
Verified: 15 Oct 2026

With method 2 the library must replace clickTag variables before the ad renders.

Open source ↗

Operations

With multiple clickTags leave the insertion's Click URL field empty (it overrides all clickTags); reports show only the sum of clicks; clctenc= (0-3) sets click URL encoding for third-party systems.

AOfficial requirement

Source: Manage click counting
How verified: Read directly
Verified: 15 Oct 2026

Trafficking notes.

Open source ↗

Several clicks in apps

Not supported

AOfficial requirement

Source: Manage click counting
How verified: Read directly
Verified: 15 Oct 2026

Multiple clickthrough URLs are not compatible with in-app (SDK) environments.

Open source ↗

SanomaClicksApi (legacy, superseded 2026-03-25)

Code pattern

<script src="https://sn.sanoma.fi/js/ClicksApi.js"></script> in <head>; SanomaClicksApi.openClickUrl('https://...') / openClickTag()

AOfficial requirement

Source: Cross-screen display, material guidelines · Click events in Google Web Designer project (PDF, 2021)
How verified: Read directly
Verified: 15 Oct 2026

Still shown on Kärkimedia's page for Aamulehti, Satakunnan Kansa and Helsingin Sanomat (served by Xandr); superseded by Sanoma's clickTag instructions effective 2026-03-25.

Open source ↗

Publisher rules

Property	Rule	Evidence
Entry HTML file	index.html	AOfficial requirement. Evidence details Source Cross-screen display, material guidelines How verified Read directly Verified 15 Oct 2026 index.html in the root of the ZIP, not in a subfolder; CSS and images may be in subfolders. Open source ↗
File names in the ZIP	must match ^[A-Za-z0-9_\-/]+(\.[A-Za-z0-9]+)?$	AOfficial requirement. Evidence details Source Cross-screen display, material guidelines How verified Read directly Verified 15 Oct 2026 No dots (other than the extension), special characters or umlauts in file names. Open source ↗
Image types	jpg, jpeg, png, gif	AOfficial requirement. Evidence details Source Cross-screen display, material guidelines How verified Read directly Verified 15 Oct 2026 Images in jpg, jpeg, png or gif. Open source ↗
Video file size	≤ 50 MB	AOfficial requirement. Evidence details Source Cross-screen display, material guidelines How verified Read directly Verified 15 Oct 2026 Video max 50 MB; formats mp4, m4v, wmv, m4a, avi, webm, 3gp, ogg, mp3, aac, ogv, m3u8. Open source ↗
Everything over HTTPS	Required	AOfficial requirement. Evidence details Source Cross-screen display, material guidelines How verified Read directly Verified 15 Oct 2026 Resource URLs SSL-protected; all materials and tracking pixels HTTPS. Open source ↗
Clicks open in	_blank	AOfficial requirement. Evidence details Source Cross-screen display, material guidelines How verified Read directly Verified 15 Oct 2026 Open clicks in a new browser window (_blank). Open source ↗ Conflict
Click areas	1	AOfficial requirement. Evidence details Source Cross-screen display, material guidelines How verified Read directly Verified 15 Oct 2026 One link; the entire ad is the clickable area (parade, vertical parade, boxes). Open source ↗
Third-party tracking tags	≤ 1 tags	AOfficial requirement. Evidence details Source Cross-screen display, material guidelines How verified Read directly Verified 15 Oct 2026 One third-party tracker allowed; click tracking can also be in the destination URL. Open source ↗
Initial load	≤ 200 KB	AOfficial requirement. Evidence details Source Cross-screen display, material guidelines How verified Read directly Verified 15 Oct 2026 HTML5 initial load 200 kb for all listed formats. Open source ↗
Limits bypassed with loaders or tags	Not allowed	AOfficial requirement. Evidence details Source Cross-screen display, material guidelines How verified Read directly Verified 15 Oct 2026 Weight limits can't be bypassed with loaders or 3rd-party tags; only explicit user activation may exceed them. Open source ↗
Sound and animation start	Only on hover or click	AOfficial requirement. Evidence details Source Cross-screen display, material guidelines How verified Read directly Verified 15 Oct 2026 Animation and sound allowed only when activated by hover or click. Open source ↗
Pointer cursor on clickable areas	Required	BOfficial recommendation. Evidence details Source Cross-screen display, material guidelines How verified Read directly Verified 15 Oct 2026 Add onmouseover cursor:pointer on the click area. Open source ↗

Sources

Cross-screen display, material guidelines · KärkimediaRead directly · 15 Oct 2026