"Lucida Grande" is hardcoded in RenderTextControlSingleLine.cpp

[Myles C. Maxfield]

Not all platforms use this default font, and there should be one source of truth for what the default font is.

[Ahmad Saleem]

We still have this: https://searchfox.org/wubkat/source/Source/WebCore/rendering/RenderTextControlSingleLine.cpp#337 & 


#if !PLATFORM(IOS_FAMILY)
    // Since Lucida Grande is the default font, we want this to match the width
    // of MS Shell Dlg, the default font for textareas in Firefox, Safari Win and
    // IE for some encodings (in IE, the default font is encoding specific).
    // 901 is the avgCharWidth value in the OS/2 table for MS Shell Dlg.
    if (style().fontCascade().firstFamily() == "Lucida Grande"_s)
        return scaleEmToUnits(901);
#endif

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https://searchfox.org/wubkat/source/Source/WebCore/rendering/RenderTextControlSingleLine.cpp#360


#if !PLATFORM(IOS_FAMILY)
    const AtomString& family = style().fontCascade().firstFamily();
    // Since Lucida Grande is the default font, we want this to match the width
    // of MS Shell Dlg, the default font for textareas in Firefox, Safari Win and
    // IE for some encodings (in IE, the default font is encoding specific).
    // 4027 is the (xMax - xMin) value in the "head" font table for MS Shell Dlg.
    if (family == "Lucida Grande"_s)
        maxCharWidth = scaleEmToUnits(4027);
    else if (style().fontCascade().hasValidAverageCharWidth())
        maxCharWidth = roundf(style().fontCascade().primaryFont().maxCharWidth());
#endif

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