Needs manual testing

User pain Issue Created
75% details#1797438: HTML5 validation is preventing form submit and not fully accessible 2012-09-28
60% details#2301527: Client side file extension validation for managed files fails on Internet Explorer 11 2014-09-24
57% details#2884052: Uploading a managed file on a custom form that allows multiple files also triggers the remove button which results in a duplicate temporary… 2017-06-06
43% details#2909128: Autocomplete intermittent on Chrome Android 2017-09-15
40% details#2168711: Wrong use of Modernizr.touch, breaks contextual links 2014-01-07
36% details#153313: Form data is lost when using the browser's back button 2007-10-19
34% details#2516938: Set the toolbar to position fixed on mobile 2015-07-01
34% details#2863444: Discourage/make impossible to select a "to" date that is before the "from" date 2017-03-23
29% details#1426646: "-Select-" option is lost when form elements uses '#states' 2012-02-03
29% details#1854030: Add hint to translation settings page when tables appear off screen 2012-11-29
29% details#1962800: form #states not working with literal integers as values in IE 2013-04-05
29% details#2186643: Autocomplete always searches the last tag 2014-02-01
29% details#2608384: Unsaved allowed html tags are lost when adding a plugin 2015-11-04
29% details#2880338: Empty state (filled) doesn't work for date field with datepicker plugin 2017-05-22
26% details#2413847: Remove .js class from core 2015-01-25
23% details#900590: Support for the readonly/readwrite attribute 2012-01-04
23% details#1836392: In the Views UI, the interaction pattern of “All displays”/ “Override this display” is confusing 2012-11-13
23% details#1855036: ARIA and accessibility improvements in entity (content) translation settings page 2012-11-30
21% details#2897430: Provide screen-reader feedback when filtering by test name. 2017-07-26
20% details#997370: Tabledrag is not hiding the correct columns 2010-12-14
17% details#1016056: Hide tabledrag handle and "Show row weights" when there is only one item in list 2012-01-24
17% details#2707669: Replace `throw` statement `Drupal.throwError` 2016-04-16
14% details#1310642: Adding drupal_add_tabledrag() support for parents with depth 0 2011-11-05
14% details#1854046: Add "changed" hints to translation settings page 2012-12-02
14% details#2215857: Behaviors get attached to removed forms 2014-04-22

Sorting of the JavaScript issue queues based on user pain rating.

User pain = Type * Priority * Public / Max score

Highlighted rows are killer issues , issues that take a significant effort to fix due to their complexity.