Troubleshooting font display problem in React Native when using the Poppins font for rendering Latin characters (ě, š, č, ř, ž) with <Font> tag

Currently, I am encountering a font rendering issue within my React Native project. Specifically, the problem arises with Latin letters such as ě, š, č, ř, ž when utilizing the Poppins font. Despite defining the font using the provided code snippet below, it fails to render correctly for these Latin characters:

<Font
fontFamily="Poppins"
fallbackFontFamily="Verdana"
  webFont={{
   url: "https://fonts.gstatic.com/s/poppins/v20/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2",
   format: "woff2",
  }}
fontWeight={400}
fontStyle="normal"
/>

Observed deviation in styling of letter ě compared to other characters

Attempted Solutions:

In an effort to resolve this issue, I experimented with various font weights, links, and formats.

Desired Outcome:

The objective is to achieve uniformity in font style throughout the document, including consistent presentation of Latin characters.

Expected end result

htmlcssreactjstypescriptfonts

Answer №1

The special characters ě, š, č, ř, ž can be found in the latin-extended subset.
If you are currently using the (basic) latin subset, then a fallback font will be displayed.

If you only require the standard version, simply open the CSS URL in your browser and take note of the urls for both latin and latin ext from the @font-face declarations.

Although I have not come across an explanation on how to incorporate multiple unicode ranges in react-native, the structure should resemble the following:

<Font
    fontFamily="Poppins"
    fallbackFontFamily="Verdana"
    webFont={[
      {
        url: "https://fonts.gstatic.com/s/poppins/v20/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2",
        format: "woff2",
        unicodeRange: "U+0000-00FF, U+0100-024F, U+1E00-1EFF, U+0400-04FF, U+0500-052F, U+0600-06FF, U+0900-097F, U+0A00-0A7F, U+1100-11FF, U+1F00-1FFF",
      },
      {
        url: "https://fonts.gstatic.com/s/poppins/v20/pxiEyp8kv8JHgFVrJJnecmNE.woff2",
        format: "woff2",
        unicodeRange: "U+0100-02AF, U+0304, U+0308, U+0329, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF",
      },
    ]}
    fontWeight={400}
    fontStyle="normal"
  />


/* latin */

@font-face {
  font-family: 'Poppins';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url(https://fonts.gstatic.com/s/poppins/v20/pxiEyp8kv8JHgFVrJJfecg.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}


/* latin-ext */

@font-face {
  font-family: 'Poppins';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url(https://fonts.gstatic.com/s/poppins/v20/pxiEyp8kv8JHgFVrJJnecmNE.woff2) format('woff2');
}

body {
  font-family: 'Poppins';
}
<h1>Hamburgefons ě, š, č, ř, ž </h1>

You also have the option to download the complete "unsubsetted" versions, but be aware that these files are significantly larger than individual unicode-range subsets (~50KB).

"files": {
        "100": "http://fonts.gstatic.com/s/poppins/v20/pxiGyp8kv8JHgFVrLPTecnFBGPaTSQ.woff2",
        "100italic": "http://fonts.gstatic.com/s/poppins/v20/pxiAyp8kv8JHgFVrJJLmE3tAOvODSVFF.woff2",
        "200": "http://fonts.gstatic.com/s/poppins/v20/pxiByp8kv8JHgFVrLFj_V15vFP-KUEg.woff2",
        "200italic": ""http://fonts.gstatic.com/s/poppins/v20/pxiDyp8kv8JHgFVrJJLmv1plFd2PQEhcqw.woff2"",
        "300": ""http://googleapis.com/google-poppins/rsquo""e",
        "regular": ""http://fonts.gstatic.com/s/poppins/v20/pxiEyp8kv8JHgFVrFJXUc1NECPY.woff2"`,

Data obtained via the developer API.

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