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chromium/content/test/data/accessibility/mac/attributes/ax-insertion-point-line-number.html 

<!--
@SCRIPT:
  emptyLine.setAccessibilityFocused(TRUE)
  wait for AXFocusedUIElementChanged on AXTextField
  emptyLine.accessibilityAttributeNames.has(AXInsertionPointLineNumber)
  emptyLine.accessibilityAttributeValue(AXInsertionPointLineNumber)
  singleLine.setAccessibilityFocused(TRUE)
  wait for AXFocusedUIElementChanged on AXTextField
  singleLine.accessibilityAttributeNames.has(AXInsertionPointLineNumber)
  singleLine.accessibilityAttributeValue(AXInsertionPointLineNumber)
  press ArrowRight
  singleLine.accessibilityAttributeValue(AXInsertionPointLineNumber)
  multiLine.setAccessibilityFocused(TRUE)
  wait for AXFocusedUIElementChanged on AXTextField
  multiLine.accessibilityAttributeNames.has(AXInsertionPointLineNumber)
  multiLine.accessibilityAttributeValue(AXInsertionPointLineNumber)
  press ArrowRight
  multiLine.accessibilityAttributeValue(AXInsertionPointLineNumber)
  press ArrowDown
  multiLine.accessibilityAttributeValue(AXInsertionPointLineNumber)
  press ArrowLeft
  multiLine.accessibilityAttributeValue(AXInsertionPointLineNumber)
  press ArrowDown
  multiLine.accessibilityAttributeValue(AXInsertionPointLineNumber)
  press ArrowRight
  multiLine.accessibilityAttributeValue(AXInsertionPointLineNumber)
  multiLine_emptyFirstLine.setAccessibilityFocused(TRUE)
  wait for AXFocusedUIElementChanged on AXTextField
  multiLine_emptyFirstLine.accessibilityAttributeNames.has(AXInsertionPointLineNumber)
  multiLine_emptyFirstLine.accessibilityAttributeValue(AXInsertionPointLineNumber)
  press ArrowDown
  multiLine_emptyFirstLine.accessibilityAttributeValue(AXInsertionPointLineNumber)
  press ArrowRight
  multiLine_emptyFirstLine.accessibilityAttributeValue(AXInsertionPointLineNumber)
-->
<!DOCTYPE html>
<input id="emptyLine">
<input id="singleLine" value="single line">
<textarea id="multiLine">
    first line
    second line
    third line
</textarea>
<textarea id="multiLine_emptyFirstLine">

    second line
    third line
</textarea>