| <!DOCTYPE html> |
| <html> |
| <body> |
| <p>Test passes if you see a single 100px by 100px green box below.</p> |
| <script> |
| const host = document.createElement('div'); |
| const shadowRoot = host.attachShadow({mode: 'closed'}); |
| shadowRoot.innerHTML = ` |
| <some-element class="item"> |
| some-element:first-child |
| <style> |
| .item { display: block; width: 100px; height: 10px; background: red; color: green; font-size: 9px; overflow: hidden; } |
| some-element:first-child { background: green; } |
| section:nth-of-type(1) { background: green; } |
| section:nth-child(3) { background: green; } |
| .item:nth-last-child(6) { background: green; } |
| a-element:first-of-type { background: green; } |
| b-element:only-of-type { background: green; } |
| a-element:last-of-type { background: green; } |
| c-element:nth-last-of-type(1) { background: green; } |
| other-element:last-child { background: green; } |
| </style> |
| </some-element> |
| <section class="item">section:nth-of-type(1)</section> |
| <section class="item">section:nth-child(3)</section> |
| <section class="item">.item:nth-last-child(6)</section> |
| <a-element class="item">a-element:first-of-type</a-element> |
| <b-element class="item">b-element:only-of-type</b-element> |
| <a-element class="item">a-element:last-of-type</a-element> |
| <c-element class="item">c-element:nth-last-of-type(1)</c-element> |
| <other-element class="item">other-element:last-child</other-element>`; |
| document.body.appendChild(host); |
| |
| const loneHost = document.createElement('div'); |
| const loneShadowRoot = loneHost.attachShadow({mode: 'closed'}); |
| loneShadowRoot.innerHTML = `<div class="item">.item:only-child |
| <style> |
| .item { display: block; width: 100px; height: 10px; background: red; color: green; font-size: 9px; overflow: hidden; } |
| .item:only-child { background: green; } |
| </style> |
| </div>`; |
| document.body.appendChild(loneHost); |
| |
| for (const element of [...shadowRoot.querySelectorAll('.item'), loneShadowRoot.firstChild]) { |
| const selector = element.innerText; |
| if (!element.matches(selector)) |
| logError(`${selector} did not match an element via element.matches`); |
| else { |
| const queryResult = element.getRootNode().querySelectorAll(selector); |
| if (queryResult.length != 1) { |
| console.log(queryResult); |
| logError(`${selector} matches ${queryResult.length} elements`); |
| } |
| } |
| } |
| |
| function logError(error) { |
| const container = document.createElement('p'); |
| container.textContent = error; |
| document.body.append(container); |
| } |
| |
| </script> |
| </body> |
| </html> |
