Measures the offset between where a native click was aimed (element center) and where it actually landed. A document-level capture-phase mousedown listener records every click, so a click that misses its target is still recorded — attributed to the nearest target and marked as a miss.
The y-ladder holds box size constant and varies viewport y: a flat mean dy means a constant offset, a mean dy that grows with y means a scale error. The height-ladder holds y roughly constant and shrinks the box to find the height at which clicks start landing outside.
| clicks recorded | 0 |
| landed outside target | 0 |
| mean dx (css px) | null |
| mean dy (css px) | null |
| dy spread | null |
| y-fit slope | null |
| y-fit intercept | null |
| verdict | insufficient-data |
| selection escaped input | NO |
| target | h | centerY | n | miss | meanDx | meanDy | dy range |
|---|
{
"runLabel": "",
"env": null,
"summary": {
"clicks": 0,
"misses": 0,
"meanDx": null,
"meanDy": null,
"spreadDy": null,
"escapedSelections": 0,
"verdict": "insufficient-data"
},
"yFit": null,
"perTarget": [],
"inputValues": {},
"selections": [],
"events": []
}