Test target:
Test font sizes from px through px step px where weight is
Test font weights from through step where size is

Font family:
-apple-system	system	sans-serif
Arial	Helvetica	serif
Other 1:
Other 2:

Language code:
en-US	zh-CN	zh-TW	zh-HK
zh-hans	zh-hant	ja-JP	ko-KR
Unspecified		Other: