font-synthesis-weight-fallback.html

<!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<title>CSS Test: font-synthesis-weight: none disables fake bold for fallback fonts</title>
<link rel="help" href="https://www.w3.org/TR/css-fonts-4/#font-synthesis-weight">
<meta name="assert" content=" If ‘weight’ is not specified, user agents must not synthesize bold faces">
<style>
    @supports not (font-synthesis-weight: none) {
        .test {color: red;}
    }
    .test {
        font-family: Arimo;
        font-size: 3em;
    }
    .nosynth {
        font-weight: bold;
        font-synthesis-weight: none;
    }
</style>

<p>Test passes if the two lines below are identical (the second line is <em>not bold</em>), and there is no red.</p>
<section class="test">
    <p>ข้อความฟิลเลอร์</p>
    <p class="nosynth">ข้อความฟิลเลอร์</p>
</section>

chromium/third_party/blink/web_tests/virtual/text-antialias/font-synthesis-weight-fallback.html