What is the secret to creating double-width characters that are precisely double the size of single-width characters?

When using terminal, many fonts that support double-width characters display them as exactly twice the width of single-width characters. For instance, these two lines should appear with the same width:

あああ
aaaaaa

However, this consistency is not maintained in browsers like Chrome or Firefox. I have tried different monospace fonts, but none of them seem to render あ precisely twice the width of a.

So my question is: Is there a way to resolve this issue using CSS? Are there any fonts that naturally meet this requirement without needing CSS intervention? Or is this simply an unsolvable problem?

htmlcssuser-interfacefonts

Answer №1

The issue you're facing is related to fonts. A majority of monospace fonts do not contain CJK characters. Therefore, when the browser needs to display these characters, it has to substitute another font which often results in different spacing and metrics compared to the original monospace font.

If you are using a Mac, the Osaka-Mono font supports both Japanese and monospaced Latin characters. By setting the font-family to Osaka-Mono, you can ensure that each Japanese character aligns perfectly with two Latin characters as shown in the example below:

body { font-family: Osaka-Mono; }
abcdefghijklmn
<br>
いろはにほへと

For users on other platforms, unfortunately, there isn't a standardized approach for CJK web fonts like there is for Latin web fonts. It may require some trial and error to find a suitable solution.

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