Multi-size Ad

To request an ad with multiple sizes, pass a string of comma-separated sizes to the data-multi-size attribute. Each size in the list must be a width followed by a lowercase 'x' followed by a height. Secondary sizes must not be larger than their corresponding dimensions specified by the width and height attributes, or the data-override-width and data-override-height attributes, if they are set. Further, the secondary sizes must not be smaller than 2/3rds, in any of the two dimensions, of their primary size counterpart, unless data-multi-size-validation is explicitly set to false. See below for some valid and invalid examples.

<b>Note that multi-size slots may have unexpected interactions with layout="responsive". For this reason it is strongly encouraged that multi-size slots use layout="fixed".</b>

Attributes

Below the term primary size refers to the width and height pair specified by the width and height attributes of the tag.

data-multi-size A string of comma separated sizes, which if present, forces the tag to request an ad with all of the given sizes, including the primary size. Each individual size must be a number (the width) followed by a lowercase 'x' followed by a number (the height). Each dimension specified this way must not be larger than its counterpart in the primary size. Further, each dimension must be no less than 2/3rds of the corresponding primary dimension, unless data-multi-size-validation is set to false.
data-multi-size-validation If set to false, this will allow secondary sizes (those specified in the data-multi-size attribute) to be less than 2/3rds of the corresponding primary size. By default this is assumed to be true.

Example - Valid multi-size request

html

<amp-ad
  width="728"
  height="90"
  type="doubleclick"
  layout="fixed"
  data-slot="/6355419/Travel"
  data-multi-size="700x90,700x60,500x60"
>
</amp-ad>

Example - Invalid multi-size request (multi-size size is too small relative to overrides)

html

<amp-ad
  width="320"
  height="50"
  type="doubleclick"
  layout="fixed"
  data-slot="/6355419/Travel"
  data-override-width="728"
  data-override-height="90"
  data-multi-size="300x25"
>
</amp-ad>

Example - Invalid multi-size request (last multi-size size is too small)

html

<amp-ad
  width="728"
  height="90"
  type="doubleclick"
  layout="fixed"
  data-slot="/6355419/Travel"
  data-multi-size="700x90,700x60,300x25"
>
</amp-ad>

Example - Valid multi-size request (ignores minimum size constraint)

html

<amp-ad
  width="728"
  height="90"
  type="doubleclick"
  layout="fixed"
  data-slot="/6355419/Travel"
  data-multi-size="700x90,700x60,300x25"
  data-multi-size-validation="false"
>
</amp-ad>