| <!DOCTYPE html> |
| <style> |
| p { |
| font:20px/1 Ahem; |
| margin:.2em; |
| } |
| .vlr { |
| -webkit-writing-mode:vertical-lr; |
| } |
| .vrl { |
| -webkit-writing-mode:vertical-rl; |
| } |
| </style> |
| <p title="LTR"><span>12 345 6789</span></p> |
| <p title="RTL" dir=rtl><span>12 345 6789</span></p> |
| <p title="VERTICAL-LR" class=vlr><span>12 345 6789</span></p> |
| <p title="VERTICAL-RL" class=vrl><span>12 345 6789</span></p> |
| <div id=log></div> |
| <script> |
| Array.prototype.forEach.call(document.querySelectorAll("p"), function (e) { |
| testOffsetFromPoint(e.firstChild, e.title); |
| e.style.textRendering = "optimizeLegibility"; |
| testOffsetFromPoint(e.firstChild, e.title + " (Complex Path)"); |
| }); |
| |
| function testOffsetFromPoint(element, name) { |
| var writingMode = getComputedStyle(element).webkitWritingMode; |
| var isVertical = writingMode && writingMode[0] == "v"; |
| var results = [ name ]; |
| getOffsetFromPoint(element, isVertical, results); |
| if (isVertical) // The last character in vertical is flaky by win/mac/linux |
| results.splice(-1, 1); |
| for (var result of results) { |
| var div = document.createElement("div"); |
| div.innerText = result; |
| log.appendChild(div); |
| } |
| } |
| |
| function getOffsetFromPoint(element, isVertical, results) { |
| if (isVertical) { |
| var x = element.offsetLeft + element.offsetWidth / 2; |
| var ymin = element.offsetTop; |
| var width = element.offsetHeight; |
| } else { |
| var y = element.offsetTop + element.offsetHeight / 2; |
| var xmin = element.offsetLeft; |
| width = element.offsetWidth; |
| } |
| var lastCharacterOffset = null; |
| var lastPosition = null; |
| for (var position = -1; position <= width + 1; ++position) { |
| if (isVertical) |
| y = ymin + position; |
| else |
| x = xmin + position; |
| var result = document.caretRangeFromPoint(x, y); |
| var characterOffset = result ? result.startOffset : null; |
| if (characterOffset === lastCharacterOffset) |
| continue; |
| var advance = position - lastPosition; |
| results.push(characterOffset + "=" + position + " (" + advance + ")"); |
| lastCharacterOffset = characterOffset; |
| lastPosition = position; |
| } |
| return results; |
| } |
| |
| if (window.testRunner) |
| testRunner.dumpAsText(); |
| </script> |
