Viewability
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Possible viewability targeting options.

Enums
`VIEWABILITY_UNSPECIFIED`	Default value when viewability is not specified in this version. This enum is a placeholder for default value and does not represent a real viewability option.
`VIEWABILITY_10_PERCENT_OR_MORE`	Bid only on impressions that are at least 10% likely to be viewable.
`VIEWABILITY_20_PERCENT_OR_MORE`	Bid only on impressions that are at least 20% likely to be viewable.
`VIEWABILITY_30_PERCENT_OR_MORE`	Bid only on impressions that are at least 30% likely to be viewable.
`VIEWABILITY_40_PERCENT_OR_MORE`	Bid only on impressions that are at least 40% likely to be viewable.
`VIEWABILITY_50_PERCENT_OR_MORE`	Bid only on impressions that are at least 50% likely to be viewable.
`VIEWABILITY_60_PERCENT_OR_MORE`	Bid only on impressions that are at least 60% likely to be viewable.
`VIEWABILITY_70_PERCENT_OR_MORE`	Bid only on impressions that are at least 70% likely to be viewable.
`VIEWABILITY_80_PERCENT_OR_MORE`	Bid only on impressions that are at least 80% likely to be viewable.
`VIEWABILITY_90_PERCENT_OR_MORE`	Bid only on impressions that are at least 90% likely to be viewable.