[Webkit-unassigned] [Bug 257478] Appending an `option` to a `select` forces a style recalc of all options

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=257478

--- Comment #1 from Ahmad Saleem <ahmad.saleem792 at gmail.com> ---
Testcase: https://jsfiddle.net/umb93s21/show

Safari Technology Preview 170 (in Private Window):

Description: Measures performance of adding option elements to a multi-selection select element.

Time:
values 6392.009987515606, 6243.90243902439, 6344.485749690196, 6384.039900249391, 6448.362720403023, 6376.089663760897, 6236.297198538367, 6259.168704156507, 6198.547215496368, 6168.674698795207, 6408.010012515703, 6432.160804020101, 6368.159203980042, 6236.297198538367, 6198.547215496314, 6305.418719211879, 6392.009987515606, 6400.000000000058, 6376.089663760897, 6360.248447205084 runs/s
avg 6326.4259764937015 runs/s
median 6364.203825592563 runs/s
stdev 86.99574668297977 runs/s
min 6168.674698795207 runs/s
max 6448.362720403023 runs/s

MiniBrowser (build-webkit --release with Patch):

Description: Measures performance of adding option elements to a multi-selection select element.

Time:
values 11743.119266055042, 11743.11926605506, 11743.119266055046, 11681.877444589309, 11773.981603153745, 11743.11926605506, 11758.530183727034, 11697.127937336842, 11712.418300653637, 11758.530183727005, 11651.495448634645, 11712.41830065365, 11758.530183727034, 11773.981603153745, 11712.418300653595, 11743.119266055019, 11789.473684210527, 11681.877444589365, 11727.748691099505, 11666.66666666675 runs/s
avg 11728.63361534258 runs/s
median 11743.11926605503 runs/s
stdev 38.0371407071838 runs/s
min 11651.495448634645 runs/s
max 11789.473684210527 runs/s

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