* Use -webkit-text-stroke instead of bold to indicate selected tags.
Bold causes the tag to change width, which is jarring and can cause
the tag to wrap around to a new line. -webkit-text-stroke doesn't
change the tag's width. Despite the name, this property is widely
supported.
* Don't wrap the checkbox in a label. In combination with flexbox, this
made the hitbox for the tag too big. You could click on empty space
outside the tag and it would still toggle the tag.
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