[Webkit-unassigned] [Bug 216208] Move all remaining flags from ElementRareData to Node to reduce the frequency

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=216208

--- Comment #1 from Ryosuke Niwa <rniwa at webkit.org> ---
We can also dramatically reduce the frequency of the creation of ElementRareData when tabIndex is set if we just special case 0 and -1. I've done some study on various poplar websites, and they also almost use 0 and -1 as follows:

d = {}; document.querySelectorAll('[tabindex]').forEach((e) => { if (e.tabIndex in d) d[e.tabIndex]++; else d[e.tabIndex]=0; });

Gmail
    {0: 176, -1: 1300} = $5

Slack
    {0: 4, 1: 0, -1: 130} = 

Facebook
    {0: 151, -1: 12}

Twitter
    {0: 31}

Quip
    {0: 53}

CNN
    {0: 7, -1: 10}

NYTimes
    {0: 1, 99: 0, 100: 0, -1: 0} 

YouTube
    {0: 59, -1: 186}

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