About

An object in CSS is a super type and represents the following subtype:

• image,
• HTML - Video Element (Movie),
• HTML - Plugin
• or nested documents (such as iframe)

They are also called replaced element. Because, for instance, the content of the HTML IMG element is replaced by the image that its src attribute designates.

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Intrinsic Dimensions

They have intrinsic dimensions:

• an intrinsic width,
• an intrinsic height,
• and an intrinsic ratio.

Property

To size (position) properly an object, you can use this two properties:

• object-fit
• object-position

Documentation / Reference

• Sizing Images and Objects in CSS