Ad specs
Ad specs, with the source next to them
Every number comes from the platform's own documentation, and every page carries that link plus the date it was last read. What the page does not cover is stated too.
Verified references
Nine platforms, each with its source
Every page says which ad type it covers, and does not hide what it leaves out.
Each page covers only the ad types whose official source has been read end to end, and names the types it leaves out in its own notes. Saying what is missing beats publishing an unverified table.
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From reading a spec to checking one
You have read the spec — now see whether the file in your hand actually fits it.
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