font-subset 0.1.0

OpenType font subsetting
Documentation 
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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="language" content="en">
    <meta name="viewport" content="width=device-width,initial-scale=1,shrink-to-fit=no">

    <style>
      @font-face {
        font-family: "Fira Mono";
        src: url("FiraMono-ascii.woff") format("woff2");
      }
      @font-face {
        font-family: "Fira Mono OpenType";
        src: url("FiraMono-ascii.ttf") format("opentype");
      }
      @font-face {
        font-family: "Roboto";
        src: url("Roboto-ascii.woff") format("woff2");
      }
      @font-face {
        font-family: "Roboto Mono";
        src: url("RobotoMono-ascii.woff") format("woff2");
      }
      @font-face {
        font-family: "Roboto Mono OpenType";
        src: url("RobotoMono-ascii.ttf") format("opentype");
      }

      body {
        font: 14px Roboto, sans-serif;
        line-height: 1.25;
        max-width: 800px;
        margin: 0 auto;
      }
      h1 {
        font-size: 3em;
        font-weight: 700;
      }
      h2 {
        font-size: 2em;
        font-weight: 600;
      }
      code, pre {
        font: 14px "Fira Mono", monospace;
        line-height: 20px;
        background: #eee;
      }
      code {
        padding: 2px;
      }
      pre {
        padding: 1em;
      }
      blockquote {
        margin: 1em 3em;
      }
      em {
        font-style: italic;
      }
      strong {
        font-weight: bold;
      }
      .font-fira-ot {
        font-family: "Fira Mono OpenType", monospace !important;
      }
      .font-roboto-mono {
        font-family: "Roboto Mono", monospace !important;
        font-synthesis-weight: none;
      }
      .font-roboto-mono-ot {
        font-family: "Roboto Mono OpenType", monospace !important;
        font-synthesis-weight: none;
      }
      .weight-600 {
        font-weight: 600;
        color: #484;
      }
      .weight-300 {
        font-weight: 300;
        color: #f44;
      }
      .weight-150 {
        font-weight: 150;
        color: #44f;
      }
    </style>
    <title>Test page</title>
  </head>
  <body>
    <h1>Test page</h1>
    <p>This page allows to <em>(manually)</em> test that <strong>the subset <em>fonts</em></strong> can be opened by browsers.</p>
    <p>The subset should contain all ASCII chars, from <code>' '</code> (0x20) to <code>'~'</code> (0x7e).</p>
    <h2>Fira Mono (WOFF2)</h2>
    <p>Simple font with a single typeface (italic and the bold weight are synthesized).</p>
    <blockquote><pre>0123456789
<em>ABCDEFGHUJKL</em>
<strong>zyxwvutsrqpo</strong>
!@#$%^&*()-+
/|\?<>[]{}</pre></blockquote>
    <h2>Fira Mono (OpenType)</h2>
    <p>Same as the previous sample, but in the OpenType format instead of WOFF2.</p>
    <blockquote><pre class="font-fira-ot">0123456789
<em>ABCDEFGHUJKL</em>
<strong>zyxwvutsrqpo</strong>
!@#$%^&*()-+
/|\?<>[]{}</pre></blockquote>
    <h2>Roboto Mono (WOFF2)</h2>
    <p>Tests subsetting a variable font with a single weight (<code>wght</code>) axis. Text with custom weights is highlighted with color:
    <code class="weight-150 font-roboto-mono">weight 150</code>, <code class="weight-300 font-roboto-mono">weight 300</code>, <code class="weight-600 font-roboto-mono">weight 600</code>.</p>
    <blockquote><pre class="font-roboto-mono">0123456789
<em>AB<span class="weight-300">CD</span><strong>EFGH</strong><span class="weight-150">UJ</span>KL</em>
<strong>zyxw<span class="weight-600">vuts</span>rqpo</strong>
<span class="weight-300">!@#$%^&*()-+</span>
<span class="weight-150">!@#$%^&*()-+</span>
/|\?<>[]{}</pre></blockquote>
    <h2>Roboto Mono (OpenType)</h2>
    <p>Same as the previous sample, but in the OpenType format instead of WOFF2.</p>
    <blockquote><pre class="font-roboto-mono-ot">0123456789
<em>AB<span class="weight-300">CD</span><strong>EFGH</strong><span class="weight-150">UJ</span>KL</em>
<strong>zyxw<span class="weight-600">vuts</span>rqpo</strong>
<span class="weight-300">!@#$%^&*()-+</span>
<span class="weight-150">!@#$%^&*()-+</span>
/|\?<>[]{}</pre></blockquote>
  </body>
</html>