Bug 119026 – Table DOM mutation methods (insertRow, insertCell) should lazy attach

• Status: RESOLVED
• Resolution: WONTFIX
• Component: Layout and Rendering

[Ryosuke Niwa]

Consider merging https://chromium.googlesource.com/chromium/blink/+/74ae9c918ea8b6b1a41871b826ec3f2a5737061c

Doing thead.insertRow, table.insertRow or tr.insertCell would sync attach, this
changes them to do lazyAttach just like doing appendChild() or insertBefore()
would have.

In a basic benchmark:

table.offsetTop;
var t = Date.now();
for (var i = 0; i < 200; i++) {
    var row = table.insertRow(0);
    for (var j = 0; j < 200; j++)
        row.insertCell(0).textContent = "foo bar";
}
table.offsetTop;
document.body.textContent = Date.now() - t;

This cuts the time from 840ms down to 550ms for a 35% speed improvement.

[Ahmad Saleem]

lazyAttach is not something in Webkit. So marking this as "RESOLVED WONTFIX".