html5 - Is it still an unline tag or does it mean something else? -

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i looking use jssor slider , in looking through code found <span u="arrowleft"...> tag (which can seen in other question: how move span different position in div)

the <u> tag used indicate underline, i've never seen u= tag. whenever try google comes underline tag results. mean?

it specifies usage of ui element. jssor slider recognizes usage of every element in slider.

for more info.

if pass html validation, here.


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