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IBM Plex Math: incorrect display of integral symbol #610

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polemon opened this issue Dec 2, 2024 · 4 comments
Open

IBM Plex Math: incorrect display of integral symbol #610

polemon opened this issue Dec 2, 2024 · 4 comments

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@polemon
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polemon commented Dec 2, 2024

There seems to be a problem with the integral symbol in IBM Plex Math:
image
This is from the preview of Chrome/Brave browser in the font settings.

It doesn't happen with any other (math) font, just IBM Plex Math.

A more correct (albeit not perfect) representation is achievable with things like Noto Sans Math:
image
@BoldMonday
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Thanks for the report.

How can the example above be replicated so we can test this on our side?

@polemon
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polemon commented Dec 3, 2024

Technically, the MathML is this:

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
  </head>

  </body>
    <div style="font-size: 16px; font-family: IBM Plex Math;">
      16:
      <math style="font:inherit" displaystyle="true" display="block">
        <mrow>
        
          <msqrt>
            <mrow>
              <munderover>
                <mo>∑</mo>
                <mrow><mi>n</mi><mo>=</mo><mn>1</mn></mrow>
                <mn>∞</mn>
              </munderover>
              <mfrac>
                <mn>10</mn>
                <msup><mi>n</mi><mn>4</mn></msup>
              </mfrac>
            </mrow>
          </msqrt>
        
          <mo>=</mo>
        
          <mrow>
            <msubsup>
              <mo>∫</mo>
              <mn>0</mn>
              <mn>∞</mn>
            </msubsup>
            <mfrac>
              <mrow><mn>2</mn><mi>x</mi> <mrow><mi>d</mi><mi>x</mi></mrow> </mrow>
              <mrow><msup><mi>e</mi><mi>x</mi></msup> <mo>−</mo> <mn>1</mn></mrow>
            </mfrac>
          </mrow>
        
          <mo>=</mo>
     
          <mfrac>
            <msup><mi>π</mi><mn>2</mn></msup>
            <mn>3</mn>
          </mfrac>
        
          <mo>∊</mo>
        
          <mi>ℝ</mi>
        
        </mrow>
      </math>
    </div>
  </body>
</html>

But it should be noted that this specific error only happens with Chrome and Brave!

In my case (I use brave) the font settings are under this URL: brave://settings/fonts
(i.e. it's one of the internal URLs of the browser, etc.)

(in case this makes any difference, I'm on Linux, Fedora 41)

@BoldMonday
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Not sure whether this is a font problem, or a browser problem.

@khaledhosny What is your impression?

@khaledhosny
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I cannot reproduce this in Chrome 131.0.6778.86 using the HTML file above, I get:
image

Nor in the chrome://settings/fonts preview:
image

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@khaledhosny @polemon @BoldMonday