├── .github └── workflows │ └── test.yml ├── .gitignore ├── LICENSE ├── README.md ├── benchmark.html ├── benchmark.tachometer.json ├── index.html ├── package-lock.json ├── package.json ├── src └── index.js ├── test └── basic.test.js ├── types └── index.d.ts └── web-test-runner.config.js /.github/workflows/test.yml: -------------------------------------------------------------------------------- 1 | name: Tests 2 | on: [push, pull_request] 3 | jobs: 4 | build: 5 | runs-on: ubuntu-latest 6 | steps: 7 | - uses: actions/checkout@v2 8 | - uses: actions/setup-node@v2 9 | with: 10 | node-version: 18 11 | - run: npm ci 12 | - run: npm run lint 13 | - run: npm run test:coverage -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | node_modules 2 | coverage 3 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | 2 | Apache License 3 | Version 2.0, January 2004 4 | http://www.apache.org/licenses/ 5 | 6 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 7 | 8 | 1. Definitions. 9 | 10 | "License" shall mean the terms and conditions for use, reproduction, 11 | and distribution as defined by Sections 1 through 9 of this document. 12 | 13 | "Licensor" shall mean the copyright owner or entity authorized by 14 | the copyright owner that is granting the License. 15 | 16 | "Legal Entity" shall mean the union of the acting entity and all 17 | other entities that control, are controlled by, or are under common 18 | control with that entity. For the purposes of this definition, 19 | "control" means (i) the power, direct or indirect, to cause the 20 | direction or management of such entity, whether by contract or 21 | otherwise, or (ii) ownership of fifty percent (50%) or more of the 22 | outstanding shares, or (iii) beneficial ownership of such entity. 23 | 24 | "You" (or "Your") shall mean an individual or Legal Entity 25 | exercising permissions granted by this License. 26 | 27 | "Source" form shall mean the preferred form for making modifications, 28 | including but not limited to software source code, documentation 29 | source, and configuration files. 30 | 31 | "Object" form shall mean any form resulting from mechanical 32 | transformation or translation of a Source form, including but 33 | not limited to compiled object code, generated documentation, 34 | and conversions to other media types. 35 | 36 | "Work" shall mean the work of authorship, whether in Source or 37 | Object form, made available under the License, as indicated by a 38 | copyright notice that is included in or attached to the work 39 | (an example is provided in the Appendix below). 40 | 41 | "Derivative Works" shall mean any work, whether in Source or Object 42 | form, that is based on (or derived from) the Work and for which the 43 | editorial revisions, annotations, elaborations, or other modifications 44 | represent, as a whole, an original work of authorship. For the purposes 45 | of this License, Derivative Works shall not include works that remain 46 | separable from, or merely link (or bind by name) to the interfaces of, 47 | the Work and Derivative Works thereof. 48 | 49 | "Contribution" shall mean any work of authorship, including 50 | the original version of the Work and any modifications or additions 51 | to that Work or Derivative Works thereof, that is intentionally 52 | submitted to Licensor for inclusion in the Work by the copyright owner 53 | or by an individual or Legal Entity authorized to submit on behalf of 54 | the copyright owner. For the purposes of this definition, "submitted" 55 | means any form of electronic, verbal, or written communication sent 56 | to the Licensor or its representatives, including but not limited to 57 | communication on electronic mailing lists, source code control systems, 58 | and issue tracking systems that are managed by, or on behalf of, the 59 | Licensor for the purpose of discussing and improving the Work, but 60 | excluding communication that is conspicuously marked or otherwise 61 | designated in writing by the copyright owner as "Not a Contribution." 62 | 63 | "Contributor" shall mean Licensor and any individual or Legal Entity 64 | on behalf of whom a Contribution has been received by Licensor and 65 | subsequently incorporated within the Work. 66 | 67 | 2. Grant of Copyright License. Subject to the terms and conditions of 68 | this License, each Contributor hereby grants to You a perpetual, 69 | worldwide, non-exclusive, no-charge, royalty-free, irrevocable 70 | copyright license to reproduce, prepare Derivative Works of, 71 | publicly display, publicly perform, sublicense, and distribute the 72 | Work and such Derivative Works in Source or Object form. 73 | 74 | 3. Grant of Patent License. Subject to the terms and conditions of 75 | this License, each Contributor hereby grants to You a perpetual, 76 | worldwide, non-exclusive, no-charge, royalty-free, irrevocable 77 | (except as stated in this section) patent license to make, have made, 78 | use, offer to sell, sell, import, and otherwise transfer the Work, 79 | where such license applies only to those patent claims licensable 80 | by such Contributor that are necessarily infringed by their 81 | Contribution(s) alone or by combination of their Contribution(s) 82 | with the Work to which such Contribution(s) was submitted. If You 83 | institute patent litigation against any entity (including a 84 | cross-claim or counterclaim in a lawsuit) alleging that the Work 85 | or a Contribution incorporated within the Work constitutes direct 86 | or contributory patent infringement, then any patent licenses 87 | granted to You under this License for that Work shall terminate 88 | as of the date such litigation is filed. 89 | 90 | 4. Redistribution. You may reproduce and distribute copies of the 91 | Work or Derivative Works thereof in any medium, with or without 92 | modifications, and in Source or Object form, provided that You 93 | meet the following conditions: 94 | 95 | (a) You must give any other recipients of the Work or 96 | Derivative Works a copy of this License; and 97 | 98 | (b) You must cause any modified files to carry prominent notices 99 | stating that You changed the files; and 100 | 101 | (c) You must retain, in the Source form of any Derivative Works 102 | that You distribute, all copyright, patent, trademark, and 103 | attribution notices from the Source form of the Work, 104 | excluding those notices that do not pertain to any part of 105 | the Derivative Works; and 106 | 107 | (d) If the Work includes a "NOTICE" text file as part of its 108 | distribution, then any Derivative Works that You distribute must 109 | include a readable copy of the attribution notices contained 110 | within such NOTICE file, excluding those notices that do not 111 | pertain to any part of the Derivative Works, in at least one 112 | of the following places: within a NOTICE text file distributed 113 | as part of the Derivative Works; within the Source form or 114 | documentation, if provided along with the Derivative Works; or, 115 | within a display generated by the Derivative Works, if and 116 | wherever such third-party notices normally appear. The contents 117 | of the NOTICE file are for informational purposes only and 118 | do not modify the License. You may add Your own attribution 119 | notices within Derivative Works that You distribute, alongside 120 | or as an addendum to the NOTICE text from the Work, provided 121 | that such additional attribution notices cannot be construed 122 | as modifying the License. 123 | 124 | You may add Your own copyright statement to Your modifications and 125 | may provide additional or different license terms and conditions 126 | for use, reproduction, or distribution of Your modifications, or 127 | for any such Derivative Works as a whole, provided Your use, 128 | reproduction, and distribution of the Work otherwise complies with 129 | the conditions stated in this License. 130 | 131 | 5. Submission of Contributions. Unless You explicitly state otherwise, 132 | any Contribution intentionally submitted for inclusion in the Work 133 | by You to the Licensor shall be under the terms and conditions of 134 | this License, without any additional terms or conditions. 135 | Notwithstanding the above, nothing herein shall supersede or modify 136 | the terms of any separate license agreement you may have executed 137 | with Licensor regarding such Contributions. 138 | 139 | 6. Trademarks. This License does not grant permission to use the trade 140 | names, trademarks, service marks, or product names of the Licensor, 141 | except as required for reasonable and customary use in describing the 142 | origin of the Work and reproducing the content of the NOTICE file. 143 | 144 | 7. Disclaimer of Warranty. Unless required by applicable law or 145 | agreed to in writing, Licensor provides the Work (and each 146 | Contributor provides its Contributions) on an "AS IS" BASIS, 147 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 148 | implied, including, without limitation, any warranties or conditions 149 | of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A 150 | PARTICULAR PURPOSE. You are solely responsible for determining the 151 | appropriateness of using or redistributing the Work and assume any 152 | risks associated with Your exercise of permissions under this License. 153 | 154 | 8. Limitation of Liability. In no event and under no legal theory, 155 | whether in tort (including negligence), contract, or otherwise, 156 | unless required by applicable law (such as deliberate and grossly 157 | negligent acts) or agreed to in writing, shall any Contributor be 158 | liable to You for damages, including any direct, indirect, special, 159 | incidental, or consequential damages of any character arising as a 160 | result of this License or out of the use or inability to use the 161 | Work (including but not limited to damages for loss of goodwill, 162 | work stoppage, computer failure or malfunction, or any and all 163 | other commercial damages or losses), even if such Contributor 164 | has been advised of the possibility of such damages. 165 | 166 | 9. Accepting Warranty or Additional Liability. While redistributing 167 | the Work or Derivative Works thereof, You may choose to offer, 168 | and charge a fee for, acceptance of support, warranty, indemnity, 169 | or other liability obligations and/or rights consistent with this 170 | License. However, in accepting such obligations, You may act only 171 | on Your own behalf and on Your sole responsibility, not on behalf 172 | of any other Contributor, and only if You agree to indemnify, 173 | defend, and hold each Contributor harmless for any liability 174 | incurred by, or claims asserted against, such Contributor by reason 175 | of your accepting any such warranty or additional liability. 176 | 177 | END OF TERMS AND CONDITIONS 178 | 179 | APPENDIX: How to apply the Apache License to your work. 180 | 181 | To apply the Apache License to your work, attach the following 182 | boilerplate notice, with the fields enclosed by brackets "[]" 183 | replaced with your own identifying information. (Don't include 184 | the brackets!) The text should be enclosed in the appropriate 185 | comment syntax for the file format. We also recommend that a 186 | file or class name and description of purpose be included on the 187 | same "printed page" as the copyright notice for easier 188 | identification within third-party archives. 189 | 190 | Copyright 2023 Nolan Lawson 191 | 192 | Licensed under the Apache License, Version 2.0 (the "License"); 193 | you may not use this file except in compliance with the License. 194 | You may obtain a copy of the License at 195 | 196 | http://www.apache.org/licenses/LICENSE-2.0 197 | 198 | Unless required by applicable law or agreed to in writing, software 199 | distributed under the License is distributed on an "AS IS" BASIS, 200 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 201 | See the License for the specific language governing permissions and 202 | limitations under the License. 203 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # open-stylable 2 | 3 | Tiny (<0.5kB min+gz) proof-of-concept implementation of an ["open-stylable"](https://github.com/WICG/webcomponents/issues/909) web component. It can be styled from the global ``, even though it uses shadow DOM. 4 | 5 | So basically: styles leak in, but they don't leak out. 6 | 7 | ```html 8 | 9 | 10 | 11 | 12 | 13 | #shadow-root 14 |
I'm red!
15 | 16 | 17 | ``` 18 | 19 | [Demo](https://nolanlawson.github.io/open-stylable) 20 | 21 | ## Usage 22 | 23 | Install: 24 | 25 | npm install open-stylable 26 | 27 | Then use as a [mixin](https://justinfagnani.com/2015/12/21/real-mixins-with-javascript-classes/): 28 | 29 | ```js 30 | import { OpenStylable } from 'open-stylable' 31 | 32 | class MyComponent extends OpenStylable(HTMLElement) { 33 | constructor() { 34 | super() 35 | this.attachShadow({ mode: 'open' }).innerHTML = '
Hello world
' 36 | } 37 | } 38 | ``` 39 | 40 | This custom element will use shadow DOM, but any styles from the `` will be copied into its shadow root. 41 | 42 | ### `connectedCallback` and `disconnectedCallback` 43 | 44 | If you use `connectedCallback` or `disconnectedCallback`, be sure to call `super`: 45 | 46 | ```js 47 | class MyComponent extends OpenStylable(HTMLElement) { 48 | connectedCallback() { 49 | super.connectedCallback() 50 | /* Your code */ 51 | } 52 | disconnectedCallback() { 53 | super.disconnectedCallback() 54 | /* Your code */ 55 | } 56 | } 57 | ``` 58 | 59 | ### In a framework 60 | 61 | The `OpenStylable` mixin allows you to use whatever constructor you like. For instance, with a [Lit](https://lit.dev/) component: 62 | 63 | ```js 64 | class MyComponent extends OpenStylable(LitElement) { 65 | /* ... */ 66 | } 67 | ``` 68 | 69 | ## Limitations 70 | 71 | This only works with open shadow DOM, not closed shadow DOM. 72 | 73 | Also, it doesn't work with selectors that cross shadow boundaries, such as `body.foo *`. 74 | 75 | Additionally, it only works for ` 20 | 23 | 24 | 25 |

open-stylable demo

26 | 27 |

28 | This is a demo of open-stylable, showing how global styles 29 | can leak into a web component, even when using shadow DOM. 30 |

31 | 32 | 33 | 34 | 35 | 36 | 53 | 54 | -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "open-stylable", 3 | "version": "1.0.0", 4 | "description": "Web component where styles leak in, but they don't leak out", 5 | "main": "src/index.js", 6 | "module": "src/index.js", 7 | "types": "types/index.d.ts", 8 | "type": "module", 9 | "scripts": { 10 | "test": "web-test-runner \"test/**/*.test.js\" --node-resolve", 11 | "test:watch": "npm t -- --watch", 12 | "test:coverage": "npm t -- --coverage", 13 | "lint": "standard", 14 | "benchmark": "tachometer --config ./benchmark.tachometer.json" 15 | }, 16 | "keywords": [ 17 | "stylable", 18 | "styleable", 19 | "web component", 20 | "styles", 21 | "shadow dom" 22 | ], 23 | "author": "Nolan Lawson ", 24 | "license": "Apache-2.0", 25 | "volta": { 26 | "node": "18.12.1", 27 | "npm": "8.19.3" 28 | }, 29 | "devDependencies": { 30 | "@esm-bundle/chai": "^4.3.4-fix.0", 31 | "@web/test-runner": "^0.15.0", 32 | "standard": "^17.0.0", 33 | "tachometer": "^0.7.0" 34 | }, 35 | "files": [ 36 | "src", 37 | "types" 38 | ], 39 | "repository": { 40 | "type": "git", 41 | "url": "git+https://github.com/nolanlawson/open-stylable.git" 42 | }, 43 | "bugs": { 44 | "url": "https://github.com/nolanlawson/open-stylable/issues" 45 | }, 46 | "homepage": "https://github.com/nolanlawson/open-stylable#readme" 47 | } 48 | -------------------------------------------------------------------------------- /src/index.js: -------------------------------------------------------------------------------- 1 | /* global MutationObserver */ 2 | 3 | let globalStyles 4 | const openStylableElements = new Set() 5 | const elementsToAnchors = new WeakMap() 6 | const delayedConnectedCallbackElements = new WeakSet() 7 | 8 | // Use empty text nodes to know the start and end anchors of where we should insert cloned styles 9 | function getAnchors (element) { 10 | let anchors = elementsToAnchors.get(element) 11 | if (!anchors) { 12 | anchors = [document.createTextNode(''), document.createTextNode('')] 13 | elementsToAnchors.set(element, anchors) 14 | element.shadowRoot.prepend(...anchors) 15 | } 16 | return anchors 17 | } 18 | 19 | function clearStyles (element) { 20 | const [startAnchor, endAnchor] = getAnchors(element) 21 | let nextSibling 22 | while ((nextSibling = startAnchor.nextSibling) !== endAnchor) { 23 | nextSibling.remove() 24 | } 25 | } 26 | 27 | function setStyles (element) { 28 | const [, endAnchor] = getAnchors(element) 29 | for (const node of globalStyles) { 30 | element.shadowRoot.insertBefore(node.cloneNode(true), endAnchor) 31 | } 32 | } 33 | 34 | function updateGlobalStyles () { 35 | globalStyles = document.head.querySelectorAll('style,link[rel="stylesheet"]') 36 | } 37 | 38 | const observer = new MutationObserver(() => { 39 | updateGlobalStyles() 40 | for (const element of openStylableElements) { 41 | clearStyles(element) 42 | setStyles(element) 43 | } 44 | }) 45 | observer.observe(document.head, { 46 | childList: true, 47 | subtree: true 48 | }) 49 | 50 | updateGlobalStyles() 51 | 52 | export const OpenStylable = superclass => (class extends superclass { 53 | connectedCallback () { 54 | try { 55 | if (super.connectedCallback) { 56 | super.connectedCallback() 57 | } 58 | } finally { 59 | openStylableElements.add(this) 60 | if (this.shadowRoot) { 61 | setStyles(this) 62 | } else { // if shadowRoot doesn't exist yet, wait to see if it gets added in connectedCallback 63 | delayedConnectedCallbackElements.add(this) // keep track of which elements needed a delay 64 | Promise.resolve().then(() => setStyles(this)) 65 | } 66 | } 67 | } 68 | 69 | disconnectedCallback () { 70 | try { 71 | if (super.disconnectedCallback) { 72 | super.disconnectedCallback() 73 | } 74 | } finally { 75 | openStylableElements.delete(this) 76 | if (delayedConnectedCallbackElements.has(this)) { // ensure our disconnected logic runs after our connected logic 77 | Promise.resolve().then(() => clearStyles(this)) 78 | } else { // run immediately, no need to delay 79 | clearStyles(this) 80 | } 81 | } 82 | } 83 | }) 84 | -------------------------------------------------------------------------------- /test/basic.test.js: -------------------------------------------------------------------------------- 1 | /* global describe, it, before, beforeEach, afterEach, getComputedStyle, customElements, HTMLElement, CSSStyleSheet */ 2 | import { expect } from '@esm-bundle/chai' 3 | import { OpenStylable } from '../src/index.js' 4 | 5 | let element 6 | 7 | before(() => { 8 | customElements.define('x-basic', class extends OpenStylable(HTMLElement) { 9 | constructor () { 10 | super() 11 | this.attachShadow({ mode: 'open' }).innerHTML = '
hello
' 12 | } 13 | }) 14 | }) 15 | 16 | beforeEach(() => { 17 | element = document.createElement('x-basic') 18 | document.body.appendChild(element) 19 | }) 20 | 21 | afterEach(() => { 22 | for (const node of [...document.body.children]) { 23 | if (node.tagName !== 'SCRIPT') { // added by test runner 24 | node.remove() 25 | } 26 | } 27 | for (const node of [...document.head.querySelectorAll('style,link[rel="stylesheet"]')]) { 28 | node.remove() 29 | } 30 | document.adoptedStyleSheets = [] 31 | }) 32 | 33 | function createConstructableStyleSheet (content) { 34 | const sheet = new CSSStyleSheet() 35 | sheet.replaceSync(content) 36 | return sheet 37 | } 38 | 39 | function addStyleTag (content) { 40 | const style = document.createElement('style') 41 | style.textContent = content 42 | document.head.appendChild(style) 43 | } 44 | 45 | it('unstyled by default', async () => { 46 | await Promise.resolve() 47 | expect(getComputedStyle(element.shadowRoot.querySelector('div')).color).to.equal('rgb(0, 0, 0)') 48 | }) 49 | 50 | it('can style an element', async () => { 51 | addStyleTag('div { color: red }') 52 | 53 | await Promise.resolve() 54 | expect(getComputedStyle(element.shadowRoot.querySelector('div')).color).to.equal('rgb(255, 0, 0)') 55 | }) 56 | 57 | it('can re-style an element', async () => { 58 | addStyleTag('div { color: red }') 59 | 60 | await Promise.resolve() 61 | expect(getComputedStyle(element.shadowRoot.querySelector('div')).color).to.equal('rgb(255, 0, 0)') 62 | addStyleTag('div { color: blue }') 63 | await Promise.resolve() 64 | expect(getComputedStyle(element.shadowRoot.querySelector('div')).color).to.equal('rgb(0, 0, 255)') 65 | 66 | for (const node of [...document.head.querySelectorAll('style')]) { 67 | node.remove() 68 | } 69 | 70 | await Promise.resolve() 71 | expect(getComputedStyle(element.shadowRoot.querySelector('div')).color).to.equal('rgb(0, 0, 0)') 72 | }) 73 | 74 | it('works with link rel stylesheet', async () => { 75 | const link = document.createElement('link') 76 | link.rel = 'stylesheet' 77 | link.href = 'data:text/css,' + encodeURIComponent('div { color: green }') 78 | document.head.appendChild(link) 79 | await Promise.resolve() 80 | expect(getComputedStyle(element.shadowRoot.querySelector('div')).color).to.equal('rgb(0, 128, 0)') 81 | }) 82 | 83 | it('works if style is modified', async () => { 84 | addStyleTag('div { color: blue }') 85 | await Promise.resolve() 86 | expect(getComputedStyle(element.shadowRoot.querySelector('div')).color).to.equal('rgb(0, 0, 255)') 87 | document.head.querySelector('style').textContent = 'div { color: red }' 88 | await Promise.resolve() 89 | expect(getComputedStyle(element.shadowRoot.querySelector('div')).color).to.equal('rgb(255, 0, 0)') 90 | }) 91 | 92 | it('works if shadow root is attached in connected callback - framework style', async () => { 93 | // mimic how lit calls attachShadow in connectedCallback 94 | class FrameworkElement extends HTMLElement { 95 | connectedCallback () { 96 | this.attachShadow({ mode: 'open' }).innerHTML = '
hello
' 97 | } 98 | } 99 | 100 | customElements.define('x-framework', class extends OpenStylable(FrameworkElement) {}) 101 | const element = document.createElement('x-framework') 102 | document.body.appendChild(element) 103 | addStyleTag('div { color: blue }') 104 | await Promise.resolve() 105 | expect(getComputedStyle(element.shadowRoot.querySelector('div')).color).to.equal('rgb(0, 0, 255)') 106 | }) 107 | 108 | describe('works if shadow root is attached in connected callback - standalone style', () => { 109 | before(() => { 110 | customElements.define('x-connected', class extends OpenStylable(HTMLElement) { 111 | connectedCallback () { 112 | super.connectedCallback() 113 | this.attachShadow({ mode: 'open' }).innerHTML = '
hello
' 114 | } 115 | }) 116 | }) 117 | 118 | it('basic test', async () => { 119 | const element = document.createElement('x-connected') 120 | document.body.appendChild(element) 121 | addStyleTag('div { color: blue }') 122 | await Promise.resolve() 123 | expect(getComputedStyle(element.shadowRoot.querySelector('div')).color).to.equal('rgb(0, 0, 255)') 124 | }) 125 | 126 | it('connect then immediately disconnect', async () => { 127 | addStyleTag('div { color: red }') 128 | const element = document.createElement('x-connected') 129 | document.body.appendChild(element) 130 | document.body.removeChild(element) 131 | 132 | await Promise.resolve() 133 | expect(element.shadowRoot.querySelectorAll('*').length).to.equal(1) // no
hello
' 156 | } 157 | }) 158 | const element = document.createElement('x-ownstyles') 159 | document.body.appendChild(element) 160 | await Promise.resolve() 161 | expect(getComputedStyle(element.shadowRoot.querySelector('div')).color).to.equal('rgb(255, 0, 0)') 162 | addStyleTag('div { color: blue; background-color: green }') 163 | // global styles go before local styles 164 | await Promise.resolve() 165 | expect(getComputedStyle(element.shadowRoot.querySelector('div')).color).to.equal('rgb(255, 0, 0)') 166 | expect(getComputedStyle(element.shadowRoot.querySelector('div')).backgroundColor).to.equal('rgb(0, 128, 0)') 167 | }) 168 | 169 | it('calls connected / disconnected callbacks', async () => { 170 | let calledConnected 171 | let calledDisconnected 172 | class Super extends HTMLElement { 173 | connectedCallback () { 174 | calledConnected = true 175 | } 176 | 177 | disconnectedCallback () { 178 | calledDisconnected = true 179 | } 180 | } 181 | 182 | customElements.define('x-callbacks', class extends OpenStylable(Super) { 183 | constructor () { 184 | super() 185 | this.attachShadow({ mode: 'open' }).innerHTML = '
hello
' 186 | } 187 | }) 188 | const element = document.createElement('x-callbacks') 189 | document.body.appendChild(element) 190 | document.body.removeChild(element) 191 | expect(calledConnected).to.equal(true) 192 | expect(calledDisconnected).to.equal(true) 193 | }) 194 | 195 | // TODO: implement this 196 | it.skip('works with insertRule', async () => { 197 | addStyleTag('div { color: blue }') 198 | await Promise.resolve() 199 | expect(getComputedStyle(element.shadowRoot.querySelector('div')).color).to.equal('rgb(0, 0, 255)') 200 | const sheets = [...document.styleSheets] 201 | sheets.at(-1).insertRule('div { color: red } ') 202 | await Promise.resolve() 203 | expect(getComputedStyle(element.shadowRoot.querySelector('div')).color).to.equal('rgb(255, 0, 0)') 204 | }) 205 | 206 | // TODO: implement this 207 | it.skip('works with adopted style sheets', async () => { 208 | document.adoptedStyleSheets = [createConstructableStyleSheet('div { color: red }')] 209 | await Promise.resolve() 210 | expect(getComputedStyle(element.shadowRoot.querySelector('div')).color).to.equal('rgb(255, 0, 0)') 211 | document.adoptedStyleSheets.push(createConstructableStyleSheet('div { color: green }')) 212 | await Promise.resolve() 213 | expect(getComputedStyle(element.shadowRoot.querySelector('div')).color).to.equal('rgb(0, 128, 0)') 214 | document.adoptedStyleSheets.splice(1, 1) 215 | await Promise.resolve() 216 | expect(getComputedStyle(element.shadowRoot.querySelector('div')).color).to.equal('rgb(255, 0, 0)') 217 | }) 218 | -------------------------------------------------------------------------------- /types/index.d.ts: -------------------------------------------------------------------------------- 1 | export declare const OpenStylable: (superclass: T) => T; -------------------------------------------------------------------------------- /web-test-runner.config.js: -------------------------------------------------------------------------------- 1 | export default { 2 | coverageConfig: { 3 | threshold: { 4 | statements: 100, 5 | branches: 100, 6 | functions: 100, 7 | lines: 100 8 | } 9 | } 10 | } 11 | --------------------------------------------------------------------------------