| <!DOCTYPE html> |
| <html> |
| <head> |
| <title>Test string hash collision in bucketing</title> |
| <link rel="help" href="https://crbug.com/488188166"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| </head> |
| <body> |
| <div id="target"></div> |
| <script> |
| // These strings all collide in Blink's string hashing function (truncated Rapidhash). |
| const S1 = "a2fe00300000000"; |
| const S2 = "a53ca1f00000000"; |
| const S3 = "aa9a42f00000000"; |
| const S4 = "ad7ee3900000000"; |
| const S5 = "a97105400000000"; |
| const S6 = "a17dd5600000000"; |
| const S7 = "a65f15b00000000"; |
| |
| function forceStyleAndLayout() { |
| void getComputedStyle(document.documentElement).color; |
| void document.body.offsetTop; |
| } |
| |
| test(() => { |
| const sheet = new CSSStyleSheet(); |
| |
| sheet.replaceSync(` |
| div .${S1} { color: red; } |
| div .${S2} { color: green; } |
| div .${S3} { color: blue; } |
| div .${S4} { color: purple; } |
| `); |
| |
| document.adoptedStyleSheets = [sheet]; |
| target.innerHTML = ` |
| <div id="host"> |
| <span class="${S1}">x</span> |
| <span class="${S2}">x</span> |
| <span class="${S3}">x</span> |
| <span class="${S4}">x</span> |
| </div> |
| `; |
| forceStyleAndLayout(); |
| |
| // Old keys: S1,S2,S3,S4 |
| // New keys: S4,S5,S6,S7 (7 distinct colliders total across old+new) |
| const rules = sheet.cssRules; |
| rules[0].selectorText = `div .${S4}`; |
| rules[1].selectorText = `div .${S5}`; |
| rules[2].selectorText = `div .${S6}`; |
| rules[3].selectorText = `div .${S7}`; |
| forceStyleAndLayout(); |
| |
| // The test passes if the browser does not crash. |
| }); |
| </script> |
| </body> |
