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<div class="relative i-full" style="block-size: 400px;">
  <canvas aria-label="Example" role="img" data-controller="chart" data-chart-type-value="doughnut" data-chart-data-value="{"labels":["Chrome","Safari","Firefox","Edge","Other"],"datasets":[{"label":"Visitors","backgroundColor":["#8ec5ff","#193cb8","#1447e6","#2b7fff","#51a2ff"],"data":[275,200,187,173,90]}]}"></canvas>
</div>
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<% @chart_data = {
  labels: [ "Chrome", "Safari", "Firefox", "Edge", "Other" ],
  datasets: [{ label: "Visitors", backgroundColor: ["#8ec5ff", "#193cb8", "#1447e6", "#2b7fff", "#51a2ff"], data: [275, 200, 187, 173, 90] }]
} %>
<div class="relative i-full" style="block-size: 400px;">
  <%= tag.canvas aria: { label: "Example" }, role: "img", data: { controller: "chart", chart_type_value: "doughnut", chart_data_value: @chart_data.to_json } %>
</div>
CSS is not required or multiple files are needed, check the notes.
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import { Controller } from "@hotwired/stimulus"
import { Chart, registerables } from "https://esm.sh/chart.js@4.5.1?standalone"
export default class extends Controller {
  static values = { type: { type: String, default: "line" }, data: Object, options: Object }
  initialize() {
    const style = getComputedStyle(document.body)
    Chart.register(...registerables)
    Chart.defaults.color = style.color
    Chart.defaults.datasets.line.tension = 0.35
    Chart.defaults.datasets.radar.tension = 0
    Chart.defaults.elements.arc.borderRadius = 6
    Chart.defaults.elements.bar.borderRadius = 6
    Chart.defaults.elements.point.radius = 0
    Chart.defaults.font.family = style.fontFamily
    Chart.defaults.font.size = 12
    Chart.defaults.interaction.intersect = false
    Chart.defaults.plugins.legend.display = false
    Chart.defaults.plugins.legend.labels.usePointStyle = true
    Chart.defaults.plugins.legend.position = "bottom"
    Chart.defaults.plugins.tooltip.backgroundColor = style.backgroundColor
    Chart.defaults.plugins.tooltip.bodyColor = style.color
    Chart.defaults.plugins.tooltip.borderColor = style.borderColor
    Chart.defaults.plugins.tooltip.borderWidth = 1
    Chart.defaults.plugins.tooltip.boxPadding = 4
    Chart.defaults.plugins.tooltip.caretSize = 0
    Chart.defaults.plugins.tooltip.titleColor = style.color
    Chart.defaults.plugins.tooltip.usePointStyle = true
    Chart.defaults.scale.grid.color = style.borderColor
  }
  connect() {
    this.chart = new Chart(this.element, this.#settings)
  }
  disconnect() {
    this.chart.destroy()
  }
  get #settings() {
    return { type: this.typeValue, data: this.dataValue, options: this.optionsValue }
  }
}

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