c2n/web-componentsv1.0.18
OverviewGetting startedComponentsIconsGuidesExamples
OverviewGetting startedComponentsIconsGuidesExamples
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Countdown

Time left until a date, or through a timer, drawn as segments, a clock or a phrase, and kept current to the second.

Attributes

NameTypeDefaultDescription
dateDate | string | number | undefinedundefinedThe moment to count down to: an ISO 8601 string or a millisecond timestamp in markup, or a Date from script. Wins over duration.
durationnumber | undefinedundefinedLength of a timer in seconds, used when date is unset. The timer starts when the element connects, unless paused; changing it restarts the timer.
unitsstringdays hours minutes secondsThe units to show, largest first, from days, hours, minutes and seconds. The largest absorbs the rest: hours minutes shows two days as 48 hours.
displayCountdownDisplaysegmentssegments draws a box per unit with its name, clock draws 14:05:31, inline writes a phrase such as "2 days 14 hours".
formatCountdownFormatlongLength of the unit names: long ("hours"), short ("hr") or narrow ("h").
trimbooleanfalseLeave out the leading units that are zero: three hours left read "3 hours 12 minutes", not "0 days 3 hours 12 minutes".
warn-atnumber0Seconds left under which the element is in its warning state (:state(warning), coloured by --c2-countdown__warning--color). 0 turns it off.
pausedbooleanfalseStop the countdown where it is. A timer resumes from the same point; a countdown to a date catches up with the time that passed.
localestring—BCP 47 locale of the unit names and digits. Empty uses the nearest lang attribute, then the browser's language.

Slots

NameDescription
endedContent shown in place of the digits once the time is over, such as "We are live!".

Events

NameTypeDescription
tickCustomEventFired whenever the shown value changes; detail.remaining is the time left in milliseconds.
completeEventFired once when the countdown reaches zero while the element is on the page.

CSS parts

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

NameDescription
segmentThe box around one unit's value and label (display="segments").
valueThe digits of one unit (display="segments").
labelThe unit name under its digits (display="segments").
separatorThe colon between two segments, hidden unless --c2-countdown__separator--display shows it.
textThe clock or phrase (display="clock" and display="inline").

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-countdown
--c2-countdown--colorcolorinheritText colour of the clock and the phrase.
--c2-countdown--font-sizefont-sizeinheritSize of the clock and the phrase.
--c2-countdown--font-weightfont-weightinheritWeight of the clock and the phrase.
--c2-countdown--font-variant-numericstringtabular-numsDigit style; tabular digits keep a ticking value from shifting the text around it.
--c2-countdown--gaplength8pxSpace between segments (and their separators).
c2-countdown > segment
--c2-countdown__segment--background-colorcolor#f4f4f5Background of a segment.
--c2-countdown__segment--borderborder1px solid #e4e4e7Border of a segment.
--c2-countdown__segment--border-radiuslength8pxCorner radius of a segment.
--c2-countdown__segment--paddinglength12pxInner spacing of a segment.
--c2-countdown__segment--min-widthlength64pxSmallest width of a segment, so the boxes line up while the digits change.
--c2-countdown__segment--gaplength4pxSpace between a segment's digits and its label.
c2-countdown > value
--c2-countdown__value--colorcolor#18181bColour of a segment's digits.
--c2-countdown__value--font-sizefont-size32pxSize of a segment's digits.
--c2-countdown__value--font-weightfont-weight600Weight of a segment's digits.
--c2-countdown__value--font-familystringinheritTypeface of a segment's digits.
--c2-countdown__value--animation-durationtime0msLength of the roll-in played when a segment's digits change; 0ms draws them still. Reduced motion always draws them still.
c2-countdown > label
--c2-countdown__label--colorcolor#52525bColour of a segment's unit name.
--c2-countdown__label--font-sizefont-size12pxSize of a segment's unit name.
--c2-countdown__label--font-weightfont-weightnormalWeight of a segment's unit name.
--c2-countdown__label--text-transformstringnoneCase of a segment's unit name, such as uppercase.
--c2-countdown__label--letter-spacinglengthnormalLetter spacing of a segment's unit name.
c2-countdown > separator
--c2-countdown__separator--displaystringnoneinline shows a colon between segments.
--c2-countdown__separator--colorcolor#a1a1aaColour of the colon between segments.
--c2-countdown__separator--font-sizefont-size32pxSize of the colon between segments.
c2-countdown > warning
--c2-countdown__warning--colorcolor#dc2626Colour of the digits and text while less than warn-at seconds are left.
c2-countdown > paused
--c2-countdown__paused--colorcolor#71717aColour of the digits and text while paused.
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displayTreeHierarchical tree view with expansion, selection, checkboxes and lazy loading.Data displayTree SelectA dropdown for picking one or several rows from a hierarchy, with checkboxes, search and a form value.InputsTreemap chartA whole split into nested rectangles, each sized by its value: market maps, budgets and disk usage.ChartTruncateClamps text to a number of lines, with an optional Show more button.Data displayUploadDrag-and-drop file selection with validation, upload progress, retry, cancellation, and attachment results.InputsView OptionsThe Display popover of a collection: layout, grouping, ordering on several levels, Show switches and visible properties, reported as one plain value.InputsVirtual ListWindowed list with built-in search, sorting, selection and an async data source.Data displayVisually HiddenText for screen readers only: kept in the accessibility tree, drawn nowhere, optionally shown while it holds focus.LayoutWaterfall chartA running total bridged by the 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