<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Containment Test: Layout containment on button</title>
<link rel="author" title="Manuel Rego Casasnovas" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-contain-1/#containment-layout">
<link rel="help" href="https://drafts.csswg.org/css2/visudet.html#propdef-vertical-align">
<link rel="match" href="reference/contain-layout-button-001-ref.html">
<meta name=assert content="Layout containment does apply to buttons, but in an inline context their baseline is synthesized from their content-box.">
<style>
button {
border: 5px solid green;
padding: 0;
/* We use a nonzero margin-bottom to be sure we're synthesizing a baseline
from the margin-box rather than from the border-box: */
margin-bottom: 2px;
contain: layout;
color: transparent;
width: 0;
height: 0;
}
</style>
<p>This test passes if it has the same output as the reference. You see the word "before", a 10px green square aligned 2px above the text's baseline, and then the word "after".</p>
before<button>b</button>after
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