html - 等宽字体字符不固定宽度

Question

我正在尝试对齐一些字符以在 html 中绘制一个框。我选择了一种等宽字体，以便字符对齐，并用每行相同数量的字符绘制框。

pre {
  font-family: 'Roboto Mono';
  white-space: pre;
}

<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=Roboto+Mono&display=swap" rel="stylesheet">
<pre>
    ╭─────────────────────────────────────────────────────────────────────────╮
    │.........................................................................│
    │-------------------------------------------------------------------------│
    │                                                                         │
    ╰─────────────────────────────────────────────────────────────────────────╯                         
</pre>

当我在浏览器中渲染它时，最右边的边缘有时会错位，这取决于使用的等宽字体。

当我使用 Roboto Mono 时:

当我使用 Space Mono 时:

出于某种原因，我的等宽字符不是等宽的。为什么会发生这种情况，我如何强制等宽以对齐字符？

Answer 1

tl;dr:Google 的字体 CDN 未提供完整的字体。下载他们提供的 zip 并自行托管字体。

---

Google 的字体 CDN 似乎没有提供某些字体的完整字符范围。比如谷歌的@import是:

@import url('https://fonts.googleapis.com/css2?family=Fira+Code&display=swap');

查看里面的CSS:

/* cyrillic-ext */
@font-face {
  font-family: 'Fira Code';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url(https://fonts.gstatic.com/s/firacode/v14/uU9eCBsR6Z2vfE9aq3bL0fxyUs4tcw4W_D1sJV37Nv7g.woff2) format('woff2');
  unicode-range: U+0460-052F, U+1C80-1C88, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;
}
/* cyrillic */
@font-face {
  font-family: 'Fira Code';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url(https://fonts.gstatic.com/s/firacode/v14/uU9eCBsR6Z2vfE9aq3bL0fxyUs4tcw4W_D1sJVT7Nv7g.woff2) format('woff2');
  unicode-range: U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}
/* more chunks like this omitted */

所以字体被分解成几个文件，他们使用 unicode-range 将字形映射到特定文件。

这些是他们在该文件中提供的所有范围:

unicode-range: U+0460-052F, U+1C80-1C88, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;
unicode-range: U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
unicode-range: U+1F00-1FFF;
unicode-range: U+0370-03FF;
unicode-range: U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;
unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;

方框绘图字符的范围是U+2500-257F，上面的列表中没有出现。

我尝试添加它们，但据我所知，提供的文件不包括该范围。

但是，您可以从 Google 下载原始字体文件(作为 .ttf 文件的 zip)。将这些字体文件之一转换为数据 url 并使用它确实可以正确呈现字形:

pre {
  font-family: 'Fira Code stripped';
}
@font-face {
  font-family: 'Fira Code stripped';
  src: url('data:application/octet-stream;base64,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');
}

<pre>
╭────────────────────────────────────────────╮
│............................................│
│--------------------------------------------│
│                                            │
╰────────────────────────────────────────────╯
</pre>

注意:为了使这个示例符合答案，我将字体缩减为呈现示例所需的 9 个字符并将其转换为 woff2。使用完整的 ttf 文件进行的外部测试产生相同的结果。

我的结论是 Google 根本没有通过他们的 CDN 提供完整的字体。