@use "/shell" as *; @use "quark:list" as list; #release-notice { /* opens once: sheet re-runs restart a delay, so gate it on the fact it writes */ &:not([data-did-open]) { @delay 7000 { is-open: ""; data-did-open: ""; } } /* prevent clicks from bubbling to the sheet */ @on mouseup, click (stop-propagation); } provider-fetch[api-url*="package-metas/index.json"][is-success] { $package-indices: prop("provision").body; /* `excom.navGroup` moves a package out of its type's list, into that group */ $ungrouped: list.reject($package-indices.packages, "navGroup"); .package-links { [bind-elements] ul:not(ul ul) { content: iterate(getPackagesByType($ungrouped, "kit-element")); } [bind-element-bases] ul:not(ul ul) { content: iterate(getPackagesByType($ungrouped, "element-base")); } [bind-tools] ul:not(ul ul) { content: iterate(getPackagesByType($ungrouped, "tool")); } /* the standalone libraries: same rows, rendered flat (shell.css) */ [bind-libraries] ul:not(ul ul) { content: iterate(getPackagesByType($ungrouped, "library")); } [bind-library-group] ul:not(ul ul) { content: iterate(list.filter($package-indices.packages, "navGroup", "libraries")); } ul:not(ul ul) > li { $pkg: item.shortName; > spa-a { route-href: "/packages/#{item.shortName}"; } } /* one `content` rule per link: a second one would rewrite the first's text on every pass */ ul:not(ul ul, [bind-libraries] ul) > li > spa-a { content: item.shortName; } [bind-libraries] ul:not(ul ul) > li > spa-a { content: displayName(item.shortName); } /* packages whose docs span several pages: one collapsible group per section */ [bind-sections] { content: iterate(item.docSections); summary { content: item.title; } details > ul { content: iterate(item.docs); spa-a { route-href: "/packages/#{$pkg}/#{item.name}"; content: item.title; } } details:not(:has(spa-a[is-active])) { open: none; } } } /* page titles: the page, then the site. The docs home keeps the title in the document head; the other routes carry theirs in markup */ spa-route[is-active] { /* a site guide */ &[route-href$=":name"] { $title-guide: list.find($package-indices.docs, "name", $route.params.name); document-title: "#{$title-guide.title or $route.params.name} · Nucleus · docs"; } /* a package README */ &[route-href$=":packageName"] { document-title: "#{displayName($route.params.packageName)} · Nucleus · docs"; } /* one page of a package's docs */ &[route-href$=":docName"] { $title-package: list.find($package-indices.packages, "shortName", $route.params.packageName); document-title: "#{docTitle($title-package, $route.params.docName)} · #{displayName($route.params.packageName)} · Nucleus · docs"; } } /* the page's markdown file, for the footer link: the docs home and each guide the index lists, and a package's page whose index entry says `markdown` (build-docs-index sets it; the dev server's index has none, so no link there). siteDocHref and the path check say which URL is the page's own: the 404 and a package's doc pages have none */ > spa-manager[active-url] { $page-path: attr("active-url").split("#").at(0).split("?").at(0); $page-name: if($page-path == SITE_HOME: SITE_HOME_DOC; else: $page-path.split("/").at(-1)); $page-guide: list.find($package-indices.docs, "name", $page-name); $page-package: list.find($package-indices.packages, "shortName", $page-name); $page-markdown: if($page-guide and siteDocHref($page-guide.name) == $page-path: "/docs/#{$page-guide.name}.md"; $page-package.markdown and "#{SITE_BASE}/packages/#{$page-package.shortName}" == $page-path: "/#{$page-package.shortName}.md"); footer [bind-page-markdown] { href: $page-markdown; content: ternary($page-markdown, "Markdown version of this page"); } } } spa-route { $route: prop("provision"); /* paramless routes name their guide in markup (the docs home, `/`); /docs/:name gets it from params */ $route-doc-name: attr("data-doc-name"); } /* the desktop aside and the mobile sheet stamp the same nav template */ [data-site-nav] { details:has(spa-a[is-active]) { /* not kosher */ open: ""; } spa-a[is-active] { aria-current: ""; } spa-a:not([is-active]) { aria-current: none; } } /* mobile sheet: Escape / back gesture while open; a tapped link closes it */ #site-menu { &[is-open] dismiss-watcher { is-active: ""; } &:not([is-open]) dismiss-watcher { is-active: none; } @on click (target: "spa-a") { is-open: none; } } #site-menu-gesture { &:has(> #site-menu[is-open]) { progress-offset: 1; } &:not(:has(> #site-menu[is-open])) { progress-offset: 0; } @on gesture-handler-start { #site-menu { is-scrubbing: ""; } } @on gesture-handler-end { #site-menu { is-open: event.detail.snap == 1; is-scrubbing: none; } } } main { @on copy-source (handle: copySource); } #search-dialog[open] { > include-content { is-active: ""; /* for some reason this is necessary on first render */ @on include-content-did-render (handle: focusInput); } input[type="search"] { /* works on all subsequent opens */ autofocus: ""; } } #search-dialog:not([open]) input[type="search"] { autofocus: none; }

detect-features

Feature detection — gate content on real browser support with plain CSS.

Features

  • Support tokens Set once on connect for CSS / Quark targeting
  • CSS-selectable Gate content with attribute selectors, no polyfills
  • JS / Quark data .provision exposes fullSupport / noSupport arrays
  • Common Web APIs Geolocation, share, bluetooth, clipboard, media-devices, service-worker, payment-request, and many more

Installation

This package is available in the NucleusKit. Or it can be used by itself:

CDN Package Manager 
<script src="https://unpkg.com/@excom/kit-utils@0.3.0/dist/index.umd.min.js"></script>
<script src="https://unpkg.com/@excom/neutron@0.2.0/dist/index.umd.min.js"></script>
<script src="https://unpkg.com/@excom/detect-features@0.1.4/dist/index.umd.min.js"></script>
 
npm install @excom/detect-features
HTML Imports JS / CSS Imports 
<!-- import path to `node_modules` will depend on your build setup -->
<script type="module" src="/node_modules/@excom/detect-features"></script>
<link rel="stylesheet" href="/node_modules/@excom/detect-features">
 
import "@excom/detect-features";
Peer dependencies (0)

Packages a consumer must install alongside this one. Workspace deps are bundled.

Package Version
View Dist Files

All exports:

.
  • types: ./dist/index.d.ts
  • import: ./dist/index.js
  • default: ./dist/index.js
./detect-features
  • types: ./dist/detect-features.d.ts
  • import: ./dist/detect-features.js
  • default: ./dist/detect-features.js
./detect-features.js
  • types: ./dist/detect-features.d.ts
  • import: ./dist/detect-features.js
  • default: ./dist/detect-features.js
./detect-features.min
  • types: ./dist/detect-features.d.ts
  • import: ./dist/detect-features.min.js
  • default: ./dist/detect-features.min.js
./detect-features.min.js
  • types: ./dist/detect-features.d.ts
  • import: ./dist/detect-features.min.js
  • default: ./dist/detect-features.min.js
./detect-features.umd.min
  • types: ./dist/detect-features.d.ts
  • default: ./dist/detect-features.umd.min.js
./detect-features.umd.min.js
  • types: ./dist/detect-features.d.ts
  • default: ./dist/detect-features.umd.min.js
./index
  • types: ./dist/index.d.ts
  • import: ./dist/index.js
  • default: ./dist/index.js
./index.js
  • types: ./dist/index.d.ts
  • import: ./dist/index.js
  • default: ./dist/index.js
./index.min
  • types: ./dist/index.d.ts
  • import: ./dist/index.min.js
  • default: ./dist/index.min.js
./index.min.js
  • types: ./dist/index.d.ts
  • import: ./dist/index.min.js
  • default: ./dist/index.min.js
./index.umd.min
  • types: ./dist/index.d.ts
  • default: ./dist/index.umd.min.js
./index.umd.min.js
  • types: ./dist/index.d.ts
  • default: ./dist/index.umd.min.js

Usage

Check full-support / no-support for a space-separated feature name.

<detect-features></detect-features>

Use CSS or Quark to react to the feature detection:

detect-features:not([full-support~="geolocation"]) ~ .needs-location {
  display: none;
}

API Reference

detect-features

Attributes (4) Role — option is configurable, state is managed by the element (read-only), or hybrid which is both. Role Attribute Type Values Prop Default state full-support
Space-separated feature names fully supported by this browser. fullSupport
tokenlist "geolocation" | "vibrate" | "bluetooth" | "usb" | "serial" | "hid" | "share" | "clipboard" | "credentials" | "media-devices" | "service-worker" | "storage" | "wake-lock" | "gpu" | "locks" | "permissions" | "connection" | "user-agent-data" | "battery" | "midi" | "webxr" | "virtual-keyboard" | "window-controls-overlay" | "contacts" | "local-storage" | "session-storage" | "indexed-db" | "notification" | "payment-request" | "web-socket" | "worker" | "shared-worker" | "broadcast-channel" | "intersection-observer" | "resize-observer" | "speech-synthesis" | "eye-dropper" | "barcode-detector" | "file-system-access" | "webrtc" | "dialog" | "view-transitions" | "cookie-store" | "offscreen-canvas" null state granted-permissions
Reserved for features that require an explicit permission grant. Not populated yet — see INTERNAL.md. grantedPermissions
tokenlist null state no-support
Space-separated feature names with no support in this browser. noSupport
tokenlist "geolocation" | "vibrate" | "bluetooth" | "usb" | "serial" | "hid" | "share" | "clipboard" | "credentials" | "media-devices" | "service-worker" | "storage" | "wake-lock" | "gpu" | "locks" | "permissions" | "connection" | "user-agent-data" | "battery" | "midi" | "webxr" | "virtual-keyboard" | "window-controls-overlay" | "contacts" | "local-storage" | "session-storage" | "indexed-db" | "notification" | "payment-request" | "web-socket" | "worker" | "shared-worker" | "broadcast-channel" | "intersection-observer" | "resize-observer" | "speech-synthesis" | "eye-dropper" | "barcode-detector" | "file-system-access" | "webrtc" | "dialog" | "view-transitions" | "cookie-store" | "offscreen-canvas" null state partial-support
Reserved for features with partial / conditional support. Not populated yet — see INTERNAL.md. partialSupport
tokenlist null
Provision (1) This provision property lives on the DOM node. Read / watch it with Quark’s prop("provision"), or listen for the neutron-provision event from app JS. Property Type provision
Same partitions as the token attributes, as string arrays for JS / Quark (fullSupport, noSupport). Not reflected as an attribute. provision
FeatureInfo
Events (0)
Dispatches — events that detect-features fires and their default actions. Dispatch Default Action
A "default action" is subsequent logic executed by the element if e.preventDefault() is not synchronously called on the event.
Listeners — events that detect-features listens for which will trigger subsequent actions. Listener Type Action
Commands — verbs detect-features accepts as a command event (HTML Command API): from a <button command commandfor>, an <event-handler command-name>, or a CommandEvent. Command Action
Recognized Elements (0) Child or descendant elements are recognized by detect-features and relevant to its functionality. Element Relationship Required
Styles (0)
Classes — optional classes that change the appearance of detect-features. Class Description
Variables — public CSS variables for theming detect-features. Opt-out:
If you wish to opt-out of these styles on a case-to-case basis, use property all: revert-layer. Valence.css ships this as .unstyled and .unstyled-all for the entire tree.
Variable Syntax Default
Aliases — @custom-selector synonyms so custom elements can share semantic styles. Element aliases match the host tag / .tag-* class; state aliases match attributes (nested under the element alias). Alias Kind Matches
Release notes (1)

0.1.1

  • Ship only dist (and declared extras) in the npm tarball; drop build logs, tests and sources
View Source

Examples

Gate a whole section

full-support lists every feature this browser supports; no-support lists the rest. Wrap a whole section instead of one element by pairing :has() with the same attribute selector:

body:has(detect-features:not([full-support~="geolocation"])) #store-locator {
  display: none;
}

Web Share progressive UI

Show a share affordance only when share is listed in full-support. Browsers without Web Share keep the fallback copy instead.

Beta. The Nucleus Stack is in beta for a few weeks until features are stabilized and optimized.

Thanks — we'll email you when it ships.

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