Popover CSS Inspector

Displays CSS attributes of elements in a Bootstrap popover. Ideal for design systems and style guides.

• Easy to use - just add data-bs-custom-class="popover-css-inspector" to the element (requires Bootstrap 5 JavaScript)
• Customizable with your own CSS and Bootstrap's Popover options
• Popover remains static on the document and does not reposition on scroll
• Supports Bootstrap 5 dark mode
• Option to hide CSS elements - e.g. just add data-css-inspector-hide="font-size" to prevent font-size properties from displaying
• Some CSS properties are hidden by default but can be enabled - e.g. just add data-css-inspector-show="border" to show border properties
• Reloads CSS attributes if the theme is changed via the data-bs-theme attribute - perfect for checking color value changes between light and dark mode
• Supports optional title with data-bs-title attribute.
• Only 3 KB minified and gzipped!

Quick start

Several quick start options are available:

• Download the latest release
• Clone the repo git clone https://github.com/coliff/popover-css-inspector.git
• Install with npm npm install popover-css-inspector
• Install with yarn yarn add popover-css-inspector
• Install with Composer composer require coliff/popover-css-inspector

Usage

1. Add the data-bs-custom-class="popover-css-inspector" to the element you'd like to show the popover on. For example, a button.

<button
  type="button"
  class="btn btn-primary"
  data-bs-toggle="popover"
  data-bs-custom-class="popover-css-inspector">
  Button
</button>

2. Load the script (either async or defer is recommended):

<script src="/js/popover-css-inspector.min.js" defer></script>

3. Some CSS properties are opt-in only. For example, to show border properties, add data-css-inspector-show="border" to the element.

4. All CSS properties can be hidden. For example, to hide font-size properties, add data-css-inspector-hide="font-size" to the element.

5. Optional. Consider adding the pe-none class to the element to prevent the popover from being triggered by the user.

How it works

The script will look for any element with the data-bs-custom-class="css-inspector" attribute and add a click event listener to it. When clicked, it will get the element's CSS attributes and display them in a Bootstrap popover.

Demo

Demo page

List of CSS properties

These CSS properties are displayed by default unless their value is null or empty. You can opt out of these rows with data-css-inspector-hide.

| Property | Opt-out attribute | | -------------------- | ---------------------------------------------- | | animation-duration | data-css-inspector-hide="animation-duration" | | animation-name | data-css-inspector-hide="animation-name" | | background-color | data-css-inspector-hide="bg-color" | | border-radius | data-css-inspector-hide="b-radius" | | color | data-css-inspector-hide="color" | | font-size | data-css-inspector-hide="font-size" | | font-style | data-css-inspector-hide="font-style" | | font-weight | data-css-inspector-hide="font-weight" | | height | data-css-inspector-hide="height" | | margin | data-css-inspector-hide="margin" | | max-height | data-css-inspector-hide="max-height" | | max-width | data-css-inspector-hide="max-width" | | opacity | data-css-inspector-hide="opacity" | | padding | data-css-inspector-hide="padding" | | text-align | data-css-inspector-hide="text-align" | | text-transform | data-css-inspector-hide="text-transform" | | width | data-css-inspector-hide="width" |

Note: Most attributes are hidden if the value is none or null.

List of opt-in CSS properties

These CSS properties are hidden by default and are only shown when included in data-css-inspector-show.

| Property | Opt-in attribute | | ---------------------------- | ------------------------------------------------------ | | accent-color | data-css-inspector-show="accent-color" | | align-content | data-css-inspector-show="align-content" | | align-items | data-css-inspector-show="align-items" | | align-self | data-css-inspector-show="align-self" | | animation | data-css-inspector-show="animation" | | animation-delay | data-css-inspector-show="animation-delay" | | animation-direction | data-css-inspector-show="animation-direction" | | animation-fill-mode | data-css-inspector-show="animation-fill-mode" | | animation-iteration-count | data-css-inspector-show="animation-iteration-count" | | animation-play-state | data-css-inspector-show="animation-play-state" | | animation-timing-function | data-css-inspector-show="animation-timing-function" | | appearance | data-css-inspector-show="appearance" | | aspect-ratio | data-css-inspector-show="aspect-ratio" | | backdrop-filter | data-css-inspector-show="backdrop-filter" | | background-blend-mode | data-css-inspector-show="background-blend-mode" | | background-image | data-css-inspector-show="bg-image" | | background-position | data-css-inspector-show="bg-position" | | background-repeat | data-css-inspector-show="bg-repeat" | | background-size | data-css-inspector-show="bg-size" | | border | data-css-inspector-show="border" | | border-bottom-color | data-css-inspector-show="b-bottom-color" | | border-bottom-width | data-css-inspector-show="b-bottom-width" | | border-color | data-css-inspector-show="b-color" | | border-left-width | data-css-inspector-show="b-left-width" | | border-style | data-css-inspector-show="b-style" | | border-width | data-css-inspector-show="b-width" | | box-shadow | data-css-inspector-show="box-shadow" | | box-sizing | data-css-inspector-show="box-sizing" | | clip-path | data-css-inspector-show="clip-path" | | column-gap | data-css-inspector-show="column-gap" | | color-scheme | data-css-inspector-show="color-scheme" | | cursor | data-css-inspector-show="cursor" | | display | data-css-inspector-show="display" | | filter | data-css-inspector-show="filter" | | float | data-css-inspector-show="float" | | flex-direction | data-css-inspector-show="flex-direction" | | flex-wrap | data-css-inspector-show="flex-wrap" | | font-family | data-css-inspector-show="font-family" | | font-variant | data-css-inspector-show="font-variant" | | gap | data-css-inspector-show="gap" | | grid-auto-flow | data-css-inspector-show="grid-auto-flow" | | grid-column | data-css-inspector-show="grid-column" | | grid-row | data-css-inspector-show="grid-row" | | grid-template-columns | data-css-inspector-show="grid-template-columns" | | grid-template-rows | data-css-inspector-show="grid-template-rows" | | hyphens | data-css-inspector-show="hyphens" | | isolation | data-css-inspector-show="isolation" | | justify-items | data-css-inspector-show="justify-items" | | justify-self | data-css-inspector-show="justify-self" | | letter-spacing | data-css-inspector-show="letter-spacing" | | line-break | data-css-inspector-show="line-break" | | line-height | data-css-inspector-show="line-height" | | list-style | data-css-inspector-show="list-style" | | margin-bottom | data-css-inspector-show="margin-bottom" | | margin-left | data-css-inspector-show="margin-left" | | margin-right | data-css-inspector-show="margin-right" | | margin-top | data-css-inspector-show="margin-top" | | mix-blend-mode | data-css-inspector-show="mix-blend-mode" | | min-height | data-css-inspector-show="min-height" | | min-width | data-css-inspector-show="min-width" | | object-fit | data-css-inspector-show="object-fit" | | object-position | data-css-inspector-show="object-position" | | overflow | data-css-inspector-show="overflow" | | overflow-wrap | data-css-inspector-show="overflow-wrap" | | outline | data-css-inspector-show="outline" | | outline-offset | data-css-inspector-show="outline-offset" | | place-content | data-css-inspector-show="place-content" | | place-items | data-css-inspector-show="place-items" | | pointer-events | data-css-inspector-show="pointer-events" | | position | data-css-inspector-show="position" | | row-gap | data-css-inspector-show="row-gap" | | text-decoration | data-css-inspector-show="text-decoration" | | text-decoration-thickness | data-css-inspector-show="text-decoration-thickness" | | text-indent | data-css-inspector-show="text-indent" | | text-overflow | data-css-inspector-show="text-overflow" | | text-shadow | data-css-inspector-show="text-shadow" | | text-underline-offset | data-css-inspector-show="text-underline-offset" | | text-wrap | data-css-inspector-show="text-wrap" | | transform | data-css-inspector-show="transform" | | transform-origin | data-css-inspector-show="transform-origin" | | transition | data-css-inspector-show="transition" | | transition-delay | data-css-inspector-show="transition-delay" | | transition-duration | data-css-inspector-show="transition-duration" | | transition-property | data-css-inspector-show="transition-property" | | transition-timing-function | data-css-inspector-show="transition-timing-function" | | user-select | data-css-inspector-show="user-select" | | vertical-align | data-css-inspector-show="vertical-align" | | white-space | data-css-inspector-show="white-space" | | will-change | data-css-inspector-show="will-change" | | writing-mode | data-css-inspector-show="writing-mode" | | word-break | data-css-inspector-show="word-break" | | word-spacing | data-css-inspector-show="word-spacing" | | word-wrap | data-css-inspector-show="word-wrap" | | z-index | data-css-inspector-show="z-index" |

Browser support

Works well with all the browsers supported by Bootstrap.

Credits

Created by Christian Oliff with help from GitHub Copilot.