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Bootstrap class: .float-*-left

<div class="float-left">Float left on all viewport sizes</div>
<div class="float-sm-left">Float left on viewports sized SM (small) or wider</div>
<div class="float-md-left">Float left on viewports sized MD (medium) or wider</div>
<div class="float-lg-left">Float left on viewports sized LG (large) or wider</div>
<div class="float-xl-left">Float left on viewports sized XL (extra-large) or wider</div>

Preview

Float left on all viewport sizes
Float left on viewports sized SM (small) or wider
Float left on viewports sized MD (medium) or wider
Float left on viewports sized LG (large) or wider
Float left on viewports sized XL (extra-large) or wider