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node_modules/css-tree/lib/lexer/units.js

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+export const length = [
+    // absolute length units https://www.w3.org/TR/css-values-3/#lengths
+    'cm', 'mm', 'q', 'in', 'pt', 'pc', 'px',
+    // font-relative length units https://drafts.csswg.org/css-values-4/#font-relative-lengths
+    'em', 'rem',
+    'ex', 'rex',
+    'cap', 'rcap',
+    'ch', 'rch',
+    'ic', 'ric',
+    'lh', 'rlh',
+    // viewport-percentage lengths https://drafts.csswg.org/css-values-4/#viewport-relative-lengths
+    'vw', 'svw', 'lvw', 'dvw',
+    'vh', 'svh', 'lvh', 'dvh',
+    'vi', 'svi', 'lvi', 'dvi',
+    'vb', 'svb', 'lvb', 'dvb',
+    'vmin', 'svmin', 'lvmin', 'dvmin',
+    'vmax', 'svmax', 'lvmax', 'dvmax',
+    // container relative lengths https://drafts.csswg.org/css-contain-3/#container-lengths
+    'cqw', 'cqh', 'cqi', 'cqb', 'cqmin', 'cqmax'
+];
+export const angle = ['deg', 'grad', 'rad', 'turn'];    // https://www.w3.org/TR/css-values-3/#angles
+export const time = ['s', 'ms'];                        // https://www.w3.org/TR/css-values-3/#time
+export const frequency = ['hz', 'khz'];                 // https://www.w3.org/TR/css-values-3/#frequency
+export const resolution = ['dpi', 'dpcm', 'dppx', 'x']; // https://www.w3.org/TR/css-values-3/#resolution
+export const flex = ['fr'];                             // https://drafts.csswg.org/css-grid/#fr-unit
+export const decibel = ['db'];                          // https://www.w3.org/TR/css3-speech/#mixing-props-voice-volume
+export const semitones = ['st'];                        // https://www.w3.org/TR/css3-speech/#voice-props-voice-pitch