โฑ๐ง under construction -> :root, <html>, document.documentElement
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CSS โฉ values โฉ relative โฉ units โฉ rem
rem
rem = <html> ็ font-size
<html>
font-size
โญ rem ๆฏ โroot emโ ็็ธฎๅฏซ๏ผr ๆ :root (<html>)ใ
r
:root
/* :root = html */ :root { font-size: 16px; } /* โญ๏ธ ๅฎ็พฉ rem = 16px */ h1 { font-size: 2rem; } /* 2rem = 32px */ p { font-size: 1rem; } /* 1rem = 16px */
็จ em ๆๅฐ่ด็ดฏ็ฉๆๆ๏ผ็จ rem ๅฏ้ฟๅ ้็จฎๆๆใ
MDN โฉ CSS values and units
ไธๆฌกๆๆ CSS ๅญ้ซๅฎไฝ๏ผpxใemใrem ๅ %