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chromium/third_party/blink/web_tests/wpt_internal/css/css-fonts/font-face-weight-auto-variable-synthetic-bold.html 

<!DOCTYPE html>
<html lang="en">
<meta charset="utf-8"/>
<title>CSS Test: Support for font-weight:auto in @font-face</title>
<link rel="match" href="font-face-weight-auto-variable-synthetic-bold-ref.html">
<link rel="help" href="https://www.w3.org/TR/css-fonts-4/#font-prop-desc" />
<meta name="assert" content="synthetic bold is applied to variable fonts">
<style>
    @font-face {
        font-family: "Roboto";
        src: url('support/fonts/roboto_var_light_range.ttf') format('truetype');
        font-display: swap;
        font-style: normal;
        font-weight: auto;
    }
    .weight400 {
        font-family: "Roboto";
        font-size: 3em;
        font-weight: 400;
    }
    .weight900 {
        font-family: "Roboto";
        font-size: 3em;
        font-weight: 900;
    }
</style>

<p class="weight400">text</p>
<p class="weight900">text</p>