Embed w/o dimensions

render with flex sizing (width/height attributes are ignored on display)

Embed w/ dimensions

width="640px" height="360px"

render with flex sizing (width/height attributes are ignored on display)

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Embed w/ dimensions

width="640px" height="360px" class="custom"

use exact specified width/height

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Embed w/ dimensions

width="640px" height="360px" class="custom aspect"

use ratio derived from exact specified width/height

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Embed w/o dimensions

class="custom aspect"

use ratio derived from exact specified width/height

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Embed w/o dimensions

class="custom"

use exact specified width/height

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