搜集了一些比较注重前端的网站的"font family"实现方式。
十五言
Roboto,"Helvetica Neue","Segoe UI",Verdana,Tahoma,"Hiragino Sans GB","Microsoft YaHei","WenQuanYi Micro Hei",sans-serif
apple-system,SF UI Text,Arial,PingFang SC,Hiragino Sans GB,Microsoft YaHei,WenQuanYi Micro Hei,sans-serif
知乎
"Helvetica Neue","Helvetica","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC","WenQuanYi Micro Hei","Arial",sans-serif
小米
"Helvetica Neue",Helvetica,Arial,"Microsoft Yahei","Hiragino Sans GB","Heiti SC","WenQuanYi Micro Hei",sans-serif
锤子
PingFang SC,Helvetica Neue,Helvetica,Arial,Hiragino Sans GB,Microsoft Yahei,\\5FAE\8F6F\96C5\9ED1,STHeiti,\\534E\6587\7EC6\9ED1,sans-serif
网易严选
"Heiti SC","Lucida Grande","Hiragino Sans GB","Hiragino Sans GB W3",verdana
站酷
"PingFang SC","Lantinghei SC","Microsoft YaHei","HanHei SC","Helvetica Neue","Open Sans",Arial,"Hiragino Sans GB","微软雅黑",STHeiti,"WenQuanYi Micro Hei",SimSun,sans-serif
推荐阅读
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Web 中文字体应用指南（文章很老，但值得看）