(Possibly we can ignore 'color' for this issue... Only Gecko matches the spec there, and it has a darker border color than the other browsers. I'll follow up on that in a new spec issue.)

Filed https://chromium-review.googlesource.com/521044 to see if all tests pass - nothing we should land before the spec updates, though.

Massive rebaselining is required, since each HR will now end up establishing a PaintLayer. I'm not convinced it's worthwhile to make this change. A PaintLayer isn't that cheap, is it? While we're not going to increase the PaintLayer tree depth by more than one here (and they'll typically all be leaf nodes), but still. Memory-wise and performance-wise?

I'm tempted to leave this unresolved as long as specifying overflow:hidden automatically means that we'll establish a PaintLayer. But WDYT?

PaintLayers are indeed more expensive. But <hr> is not common, right? I don't think
the performance matters.

HR definitely isn't as common as hydrogen, but still widely used, right? Or?
If there are no concerns, I might just go ahead and assign reviewers to that CL.

I don't think it will be a significant performance problem to apply PaintLayers
to <hr>. So if that is the only blocker and the CL is ready, I'd say go ahead.

Yeah, I'll just do it. Thanks for your feedback. :)

I looked in httparchive for pages that have more than 100 <hr>s in the top-level resource and sorted them by <hr> count, descending. (I couldn't figure out how to write an SQL query for this particular question, so I ended up using REGEXP_MATCH(LOWER(body), r'(<hr(?:\s[^>]*>|>)(?:[^<]+|<[^h][^>]*>|<h[^r][^>]*>)*){100,}'), downloaded the result as JSON, and then processed that with javascript.)

Maybe these can be used to evaluate impact on real-world <hr>-heavy pages.

page,count
http://www.peachd.com/,1394
http://www.sem40.ru/,1218
http://www.1001rimes.com/,994
http://www.bidfta.com/,985
http://www.gratiscursus.be/,710
http://www.rotochamp.com/,683
http://www.annoncelight.dk/,663
http://www.helpinghandsinternational.biz/,500
http://www.iguanacustom.com/,461
http://www.illibraio.it/,436
http://www.astronautix.com/,416
http://www.equitybulls.com/,390
http://www.handyraketen.de/,385
http://www.ijareeie.com/,345
http://www.tgju.org/,341
http://www.animefrost.co/,335
http://www.forgottenbooks.com/,317
http://www.sat2hd.tv/,303
http://www.akcijeikatalozi.rs/,293
http://www.3dscanstore.com/,286
http://www.mogera.jp/,284
http://www.tavid.ee/,282
http://www.unwatch.org/,272
http://www.deplacementspros.com/,270
http://www.theonewatches.ru/,240
http://www.newlineentertainment.com/,238
http://www.daylimovie.com/,238
http://www.oggiintv.eu/,234
http://www.merorojgari.com/,230
http://www.audiodim.me/,224
http://www.haloshop.vn/,213
http://www.hikingproject.com/,209
http://www.nude-moon.com/,209
http://www.pleshop.ru/,207
http://www.roboshop.com.tr/,207
http://www.cosmodatastock.gr/,207
http://www.mtbproject.com/,204
http://www.rusanalogi.ru/,204
http://www.wbhealth.gov.in/,204
http://www.retailgenius.com/,202
http://www.5er0.com/,200
http://www.iulm.it/,199
http://www.nautiljon.com/,198
http://www.nyloninfilm.com/,195
http://www.nonton.com/,195
http://www.dhsgsu.ac.in/,194
http://www.uspesna-lecba.cz/,192
http://www.today.kz/,191
http://www.mn3net.com/,188
http://www.beatsonic.co.jp/,188
http://www.bmw.pl/,188
http://www.photobash.org/,186
http://www.kinoscala.cz/,183
http://www.bmw.no/,181
http://www.allaboutaris.com/,180
http://www.xgays.org/,180
http://www.paok24.com/,180
http://www.lear.com/,177
http://www.presentepravoce.wordpress.com/,176
http://www.xibar.net/,172
http://www.allgalgaduud.com/,172
http://www.iitk.ac.in/,172
http://www.benthamopen.com/,172
http://www.badweyntimes.com/,171
http://www.dealslist.com/,171
http://www.bmw.cz/,168
http://www.dungcusangtao.com/,165
http://www.aircraftresourcecenter.com/,165
http://www.theurbandeveloper.com/,164
http://www.questarter.com/,163
http://www.tumsarf.com/,160
http://www.18comix.com/,159
http://www.ackyshine.com/,159
http://www.cream-bar.com/,159
http://www.bmw.co.jp/,158
http://www.frifagbevegelse.no/,158
http://www.marialourdesblog.com/,157
http://www.ir-translate.com/,157
http://www.davidandjoseph.cl/,156
http://www.ritou.com/,155
http://www.mondelezinternational.com/,155
http://www.thetallestman.com/,154
http://www.bmw.sk/,154
http://www.bmw.pt/,154
http://www.bmw.gr/,153
http://www.ooo.3dn.ru/,152
http://www.youtube-adds.com/,151
http://www.voodi.ee/,151
http://www.trakkulup.net/,151
http://www.nuforc.org/,150
http://www.bmw.com.tr/,149
http://www.bmw.hu/,149
http://www.diarioya.es/,149
http://www.bmw.com.au/,148
http://www.bmw.ro/,148
http://www.moh.gov.my/,147
http://www.keralapareekshabhavan.in/,145
http://www.bmw.co.za/,144
http://www.xn--tck7crbj.com/,144
http://www.ferrepat.com/,143
http://www.notrickszone.com/,140
http://www.buscounchollo.com/,140
http://www.doujin-archive.com/,140
http://www.egeurok.ru/,140
http://www.studentscholarships.org/,138
http://www.sitcomsonline.com/,138
http://www.resistir.info/,136
http://www.aldaily.com/,136
http://www.heilkraeuter.de/,135
http://www.atlasinfo.fr/,134
http://www.bakerross.co.uk/,132
http://www.runews24.ru/,132
http://www.videolina.it/,131
http://www.instantfap.com/,130
http://www.inline.ru/,130
http://www.europix.net/,129
http://www.steephill.tv/,129
http://www.virtual.ua/,128
http://www.ghtt.net/,128
http://www.bjobs.ir/,126
http://www.tuttocamere.it/,126
http://www.onmogul.com/,126
http://www.aphorisms.su/,126
http://www.animetake.tv/,126
http://www.rtbf.be/,125
http://www.baahin.net/,125
http://www.bold-themes.com/,124
http://www.shopitstyle.in/,124
http://www.necenzurovane.net/,123
http://www.unionesarda.it/,123
http://www.live-footballontv.com/,123
http://www.tourmag.com/,123
http://www.fluierul.ro/,123
http://www.rivertickets.ru/,123
http://www.suggest-keywords.com/,123
http://www.infonormandie.com/,122
http://www.bmw.com.cn/,122
http://www.dachbaustoffe.de/,121
http://www.tnecampus.org/,121
http://www.medizinfuchs.de/,121
http://www.e-lenovo.gr/,121
http://www.rechneronline.de/,120
http://www.pornoxxxteens.com/,120
http://www.soodiran.com/,120
http://www.cubehostindia.com/,120
http://www.wired.co.uk/,119
http://www.multiply-bitcoin.online/,119
http://www.gif4me.com/,118
http://www.bmw.com/,118
http://www.tinmoi24.vn/,117
http://www.xn--d1ababeji4aplhbqk6k.xn--p1ai/,117
http://www.bolod.mn/,117
http://www.ctolib.com/,116
http://www.creativetools.se/,116
http://www.lyoncapitale.fr/,116
http://www.kooxda.com/,116
http://www.createurapp.com/,116
http://www.nftevellore.org/,116
http://www.topsharebrokers.com/,115
http://www.iranjradiol.com/,115
http://www.marugujarat.in/,115
http://www.redlemon.com.mx/,114
http://www.modemfiles.blogspot.com/,114
http://www.bmw-me.com/,113
http://www.bmw.com.mx/,111
http://www.farachart.com/,110
http://www.arautos.org/,110
http://www.uprtou.ac.in/,110
http://www.bmw.ca/,110
http://www.bmw.dk/,109
http://www.mangaoh.co.jp/,109
http://www.flash-mini.com/,109
http://www.lankadeepa.lk/,108
http://www.winpenpack.com/,108
http://www.hackbase.com/,108
http://www.shilinaz.com/,108
http://www.lagu-gereja.com/,108
http://www.arquivoporno.com/,107
http://www.caratterispecialihtml.com/,107
http://www.bmw.ie/,107
http://www.thealmightyguru.com/,107
http://www.guitareman.rzb.ir/,107
http://www.ak-kurier.de/,106
http://www.defensa.com/,106
http://www.rakitan.com/,105
http://www.idealwine.com/,105
http://www.2l.pl/,105
http://www.light11.de/,105
http://www.friuligol.it/,105
http://www.lastampa.it/,104
http://www.alterinfo.net/,104
http://www.bmw.co.kr/,103
http://www.vicky.in/,102
http://www.otaiweb.com/,102
http://www.carsonnow.org/,102
http://www.monitor-invest.net/,102
http://www.kaleidoscop.com/,102
http://www.reussirmavie.net/,101
http://www.peopleofprint.com/,100
http://www.shekhauni.ac.in/,100
http://www.garysguide.com/,100
http://www.youtuberber.net/,100
http://www.tntv.pf/,100
http://www.neuropathytreatmentgroup.com/,100
http://www.tour-spb.ru/,100
http://www.souhoufi.com/,100
http://www.full-stream.nu/,100
http://www.inuinu.com/,100

(The dataset is httparchive:har.2017_05_15_chrome_requests_bodies; 474,730 pages from Alexa top 1m.)

I did a simple ad-hoc comparison. Although this may not be conclusive or significant, I thought I'd share it here. I don't currently plan to do any more tests on this.

I saved the peachd.com page, removed scripts, repeated each <hr> 10 times (when I loaded it it apparently only had 107 <hr>s, so now it has 1070) and modified the CSS so each <hr> takes up 1/10 of vertical space. Then created a copy of that page with "hr { overflow: hidden }" added in an inline stylesheet, and ran them through webpagetest with Repeat View.

https://www.webpagetest.org/result/170612_0G_5db6ccb1874162577973ce144975aa09/
https://www.webpagetest.org/result/170612_77_2075a3b129dc0316943dcf837dd7e6d1/

AFAICT there's basically no difference in performance results (e.g., for Visually Complete (ms)).

Also created a microbenchmark to compare a more extreme case (134511 <hr>s).

https://www.webpagetest.org/result/170612_2R_a6a81a64e976afbdedbba669a490a8d4/
https://www.webpagetest.org/result/170612_EE_09624031c3a55cb67c412bbccbeee24d/

Here the overflow: hidden page is indeed slower.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a2c5540dd92ca78780a8836b8325bd34440c318f

commit a2c5540dd92ca78780a8836b8325bd34440c318f
Author: Morten Stenshorne <mstensho@opera.com>
Date: Mon Jun 12 14:22:31 2017

Update HR implementation to match the spec.

Don't hardcode HR as establishing a new formatting context.
Set overflow:hidden in the UA stylesheet instead. [1]
Also specify unicode-bidi:isolate [2]

Some heavy test expectation rebaselining is necessary, since making
HR overflow:hidden entails that it will now establish a PaintLayer.

[1] https://html.spec.whatwg.org/multipage/rendering.html#the-hr-element-2
[2] https://html.spec.whatwg.org/multipage/rendering.html#bidi-rendering

BUG= 728499 

Change-Id: I1734242d240cb236269b218283bcb16b4ca7c0e4
Reviewed-on: https://chromium-review.googlesource.com/521044
Commit-Queue: Morten Stenshorne <mstensho@opera.com>
Reviewed-by: Stefan Zager <szager@chromium.org>
Cr-Commit-Position: refs/heads/master@{#478611}
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/external/wpt/html/rendering/non-replaced-elements/the-hr-element-0/hr-expected.txt
[delete] https://crrev.com/63f99bb69d83795394a801343c3827de017ecbbb/third_party/WebKit/LayoutTests/external/wpt/html/rendering/non-replaced-elements/the-hr-element-0/setting-overflow-visible-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/basic/comments-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/basic/containment-expected.txt
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[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/box_properties/border_left_width-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/box_properties/border_left_width_inline-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/box_properties/border_right-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/box_properties/border_right_inline-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/box_properties/border_right_width-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/box_properties/border_right_width_inline-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/box_properties/border_style-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/box_properties/border_style_inline-expected.txt
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[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/box_properties/border_top_inline-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/box_properties/border_top_width-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/box_properties/border_top_width_inline-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/box_properties/border_width-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/box_properties/border_width_inline-expected.txt
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[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/box_properties/margin_bottom_inline-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/box_properties/margin_inline-expected.txt
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[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/box_properties/margin_left_inline-expected.txt
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[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/box_properties/margin_right_inline-expected.txt
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[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/box_properties/padding_inline-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/box_properties/padding_left-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/box_properties/padding_left_inline-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/box_properties/padding_right-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/box_properties/padding_right_inline-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/box_properties/padding_top-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/box_properties/padding_top_inline-expected.txt
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[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/cascade/cascade_order-expected.txt
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[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/classification/list_style_position-expected.txt
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[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/color_and_background/background_attachment-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/color_and_background/background_color-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/color_and_background/background_image-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/color_and_background/background_position-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/color_and_background/background_repeat-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/color_and_background/color-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/conformance/forward_compatible_parsing-expected.txt
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[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/formatting_model/inline_elements-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/formatting_model/replaced_elements-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/formatting_model/vertical_formatting-expected.txt
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[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/css1/pseudo/pseudo_elements_in_selectors-expected.txt
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[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/fast/backgrounds/background-inherit-color-bug-expected.txt
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[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/fast/css/h1-in-section-elements-expected.txt
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[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/fast/dom/HTMLLinkElement/pending-stylesheet-count-expected.txt
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[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/fast/encoding/utf-16-little-endian-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/fast/forms/button/button-inner-block-reuse-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/fast/forms/fieldset/fieldset-align-expected.txt
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[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/fast/forms/select/select-visual-hebrew-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/fast/forms/visual-hebrew-text-field-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/fast/layers/opacity-outline-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/html/tabular_data/table_createcaption-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/html/tabular_data/td_colspan_rendering-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/paint/invalidation/flexible-box-overflow-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/paint/invalidation/flexible-box-overflow-horizontal-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/paint/invalidation/inline-block-overflow-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/paint/invalidation/layer-child-outline-expected.txt
[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/paint/invalidation/layer-outline-expected.txt
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[modify] https://crrev.com/a2c5540dd92ca78780a8836b8325bd34440c318f/third_party/WebKit/LayoutTests/platform/linux/printing/fixed-positioned-but-static-headers-and-footers-expected.txt
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