| <!DOCTYPE html> |
| |
| <math> |
| <mfrac id="mfrac"><mn>1</mn><mn>2</mn></mfrac> |
| |
| <msqrt id="msqrt"><mi>a</mi><mi>b</mi><mi>c</mi></msqrt> |
| |
| <mn id="mn4">4</mn> |
| <mn id="mn5">5</mn> |
| <mn id="mn6">6</mn> |
| <mn id="mn7">7</mn> |
| </math> |
| |
| <script> |
| document.body.offsetTop; |
| |
| var mfrac = document.getElementById("mfrac"); |
| mfrac.replaceChild(document.getElementById("mn4"), mfrac.lastChild); |
| mfrac.replaceChild(document.getElementById("mn5"), mfrac.firstChild); |
| |
| var msqrt = document.getElementById("msqrt"); |
| msqrt.replaceChild(document.getElementById("mn6"), msqrt.firstChild); |
| msqrt.replaceChild(document.getElementById("mn7"), msqrt.lastChild); |
| </script> |
