c2n/web-componentsv1.0.18
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OverviewGetting startedComponentsIconsGuidesExamples
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Meter

A measurement inside a known range — storage, quota, strength — with native meter thresholds and an optional segmented breakdown.

Attributes

NameTypeDefaultDescription
valuenumber0The measurement, between min and max. Ignored when segments are set.
minnumber0Lower end of the range.
maxnumber100Upper end of the range.
lownumber | undefinedundefinedUpper end of the low region, as in the native <meter>.
highnumber | undefinedundefinedLower end of the high region, as in the native <meter>.
optimumnumber | undefinedundefinedThe best value. Below low it makes low values optimum and high ones critical (a fuel gauge reads the other way: optimum above high); between them the middle region is optimum and both ends sub-optimum.
segmentsMeterSegment[][]Parts of a segmented meter, { label, value, color? }, in range units. Accepts a JSON string as an attribute.
labelstring—Label when the default slot is empty.
value-textstring—Words for the value ("12.4 GB of 15 GB"), shown and announced in place of the percentage or the total.

Slots

NameDescription
(default)Label shown above the bar; also the meter's accessible name. Falls back to the label attribute.
valueReplaces the value shown beside the label. Announced text still comes from value-text.

CSS parts

Shadow DOM styling hooks used with ::part(name). Prefer CSS custom properties when they cover the change.

NameDescription
headerRow holding the label and the value.
labelContainer of the label.
valueText region containing the custom value slot, or its fallback: value-text, the segments' total or the percentage.
trackThe bar's full range; carries role="meter".
indicatorThe filled part of a single-value meter.
segmentEach filled part of a segmented meter.
legendList of the segments under the bar.
legend-itemOne entry of the legend.
swatchColour mark of a legend entry.

CSS custom properties

Grouped by semantic target and state from --c2-<component>__<target>__<state>--<property>. Click a group to collapse it; click a name to copy it.

NameTypeDefaultDescription
c2-meter
--c2-meter--widthpixel100%Width of the meter; the host is a block.
--c2-meter--gappixel8pxSpace between the header, the bar and the legend.
--c2-meter--transition-durationtime300msHow long the bar takes to follow a new value.
c2-meter > track
--c2-meter__track--heightpixel8px
--c2-meter__track--border-radiusborder-radius999pxRounds the track and the ends of the fill.
--c2-meter__track--background-colorcolor#e4e4e7Colour of the unused range.
c2-meter > indicator
--c2-meter__indicator--background-colorcolor#0265dcFill while the value is optimum (and always without thresholds).
c2-meter > indicator > suboptimum
--c2-meter__indicator__suboptimum--background-colorcolor#d97706Fill while the value is sub-optimum.
c2-meter > indicator > critical
--c2-meter__indicator__critical--background-colorcolor#dc2626Fill while the value is critical.
c2-meter > segment
--c2-meter__segment--gappixel2pxSpace between two segments.
c2-meter > segment-1
--c2-meter__segment-1--background-colorcolor#0265dcFill of the 1st, 9th, 17th… segment without a color. The eight follow the theme's chart series.
c2-meter > segment-2
--c2-meter__segment-2--background-colorcolor#ea580c
c2-meter > segment-3
--c2-meter__segment-3--background-colorcolor#0f766e
c2-meter > segment-4
--c2-meter__segment-4--background-colorcolor#db2777
c2-meter > segment-5
--c2-meter__segment-5--background-colorcolor#a16207
c2-meter > segment-6
--c2-meter__segment-6--background-colorcolor#7c3aed
c2-meter > segment-7
--c2-meter__segment-7--background-colorcolor#0891b2
c2-meter > segment-8
--c2-meter__segment-8--background-colorcolor#52525b
c2-meter > label
--c2-meter__label--colorcolor#18181b
--c2-meter__label--font-sizefont-size14px
--c2-meter__label--font-weightfont-weight500
c2-meter > value
--c2-meter__value--colorcolor#71717a
--c2-meter__value--font-sizefont-size14px
--c2-meter__value--font-weightfont-weight400
--c2-meter__value--displaydisplayinlinenone hides the shown value; it is still announced.
c2-meter > legend
--c2-meter__legend--displaydisplayflexnone hides the legend of a segmented meter.
--c2-meter__legend--row-gappixel4pxSpace between two rows of legend entries.
--c2-meter__legend--column-gappixel16pxSpace between two legend entries on a row.
--c2-meter__legend--colorcolor#71717aColour of a legend entry's label.
--c2-meter__legend--font-sizefont-size12px
c2-meter > legend-value
--c2-meter__legend-value--colorcolor#18181bColour of a legend entry's value.
c2-meter > swatch
--c2-meter__swatch--sizepixel8px
--c2-meter__swatch--border-radiusborder-radius999px

Text and languages

The text the component shows, in English. It shows another language when the app adds one with addTranslations, under meter, and the nearest lang asks for it; any message not translated stays in English. {0}, {1}… stand for the values a message carries. Languages guide.

KeyEnglishValues
labelMeter—
total{0} of {1}{0} value
{1} max
segment{0}: {1}{0} label
{1} value
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as one JSON object, picked by the nearest lang.GuideFrameworksUse the components from React, Vue, Angular, Svelte, Lit or plain HTML — typed events, generated template types, and the one piece of configuration each framework needs.GuideUsing c2n in an applicationThe workflow behind every c2n app: load the theme once, use c2-* tags directly, and turn every repeated pattern into a small variant or composed component.GuideAI toolsGive Claude Code, Codex, Google Antigravity or GitHub Copilot the c2n skill, live component APIs, examples and application conventions.GuideNo components match.
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