2.1.163 [HTML5] Section 10.4.1 Embedded content

V0355: No default styles are applied to the video element

The specification states:

 10.4.1 Embedded content
     ...
     The following CSS rules are expected to apply:
         ...
         video { object-fit: contain; }

All document modes (All versions)

No default styles are applied to the video element.

V0356: The default border style for the iframe element is border-style: none in default styles

The specification states:

 10.4.1 Embedded content
     ...
     The following CSS rules are expected to apply:
  
         iframe { border: 2px inset; }

All document modes (All versions)

The default border style for the iframe element is border-style: none in default styles.

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