Implicit transition

by stopsatgreen

HTML

<div>
    <h1>Hi</h1>
</div>

CSS

div { padding: 1em; }

h1 {
    border: 0.25em solid blue;
    font-size: 1em;
    transition: font-size 2s;
}

div:hover h1 { font-size: 4em; }