Publishers now have the option for their 1x1 widget(s) to automatically render within IAB's fixed ad unit sizing recommendations by adding the attribute data-banner-size to their widget's div. For example, if we were to specify:

data-banner-size="300x250"

The widget would automatically render in the following 300x250 format:

The following sizes are supported:

120x600

160x600

240x400

250x250

300x50

300x250

300x600

300x1050

320x50

336x280

640x1136

728x90

720x300

750x1334

970x250

970x550

1080x1920

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