[css-fonts-4] Resolve #2221 on use of font-variation-settings

Author: svgeesus

css-fonts-4/Overview.bs

@@ -5367,13 +5367,22 @@ over OpenType or TrueType font variations.
 It is intended as a way of providing access to font variations
 that are not widely used but are needed for a particular use case.
 
+The use of font variation settings
+does not affect font selection
+where a fallback font is to be used,
+where using font properties for the same axis
+would have an effect on font selection.
+
 When possible,
 authors should generally use the other properties related to font variations
-(such as 'font-optical-sizing')
-whenever possible
+(such as 'font-optical-sizing'),
 and only use this property for special cases
 where its use is the only way of accessing a particular infrequently used font variation.
 
+For example,
+it is preferable to use 'font-weight!!property': 700
+rather than 'font-variation-settings': wght 700.
+
 A value of ''font-variation-settings/normal'' means that no change in glyph shape, matching, or positioning occurs due to this property.
 
 The <<string>> is a case-sensitive OpenType or TrueType variation axis name.
@@ -5387,13 +5396,14 @@ so they are not limited to explicitly registered OpenType / TrueType variation a
 Fonts defining custom axis names
 should follow the <a href="https://www.microsoft.com/typography/otspec/fvar.htm">name rules</a> defined in the OpenType specification.
 
-Axis values not present in the font
-are ignored and therefore have no effect;
+If a given axis is not supported by a font,
+its value setting is ignored and therefore has no effect;
 a user agent must not attempt to synthesize fallback behavior based on these axis tags.
 Other axis values within the same CSS 'font-variation-settings' statement are not ignored.
 
-Axis values greater or less than the range supported by the font
-are clamped to the closest value supported by the font.
+If a variation axis is supported by a font
+but its set value is greater or less than the predefined font range,
+it will be clamped to the closest value supported by the font.
 
 Values are allowed to be fractional or negative.