How to understand < div style="100%" >?

Vague idea of what can be discussed, but never seen such a design, especially because visually no effect on the element to allocate failed.

Either this is a mistake or there is some nuance, because searching the web gave a couple of options where everything is written. And answers with this attribute are listed on Stackoverflow, however, does not explain what the author wanted specifically to say this.
July 2nd 19 at 18:14
2 answers
July 2nd 19 at 18:16
It's just style, baby)))
Nah, someone stupid. under pattern misses. the idea style='propertyName: propertyValue', and then style='propertyValue'
So, Yes, embarrassed that an identical entry is present in the response

However, as far as I remember, it should not be. ) - Ashton_Hint commented on July 2nd 19 at 18:19
July 2nd 19 at 18:18
One "teacher" has promel attribute, the second "student" found Kosyakova code and looking at how it's used))))))))

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