27432 2014-11-25 17:08:12 +0000 The current [WHATWG] spec text for <input type=number> stepping can cause stepping in the opposite direction to the one requested 2015-07-09 12:12:15 +0000 1 1 1 Unclassified HTML WG HTML5 spec unspecified PC All RESOLVED FIXED P1 normal --- 1 jwatt dave.null mike plh public-html-admin public-html-wg-issue-tracking public-html-bugzilla oldest_to_newest 115474 0 jwatt 2014-11-25 17:08:12 +0000 Right now Mozilla's <input type=number> stepping code has checks and tests to make sure that a step up never causes the value to decrease, and a step down never causes the value to increase. The current spec text seems to cause this to happen in certain circumstances. For example, data:text/html,<input type=number value=1 max=0> Actually, checking Chrome I see that they prevent a stepUp() on that example from changing the value too, so it's not just Firefox. We essentially prevent this by having a step between steps 8 and 9 that causes us to abort if we're doing a step up and 'value' is less than the value before the step was initiated, and a similar check for step down. 121051 1 mike 2015-06-16 10:23:59 +0000 Making this a higher priority to actively seek more feedback on from implementers and webdevs. 121888 2 plh 2015-07-08 19:17:34 +0000 https://github.com/w3c/spork/pull/15 This does two things: 1. modify step 5 to add a variable "current value" [[ 5. If applying the algorithm to convert a string to a number to the string given by the element's value does not result in an error, then let value be the result of that algorithm. Otherwise, let value be zero. Let current value be the same as value. ]] 2. Insert two steps before step 9 (which becomes step 11 below) [[ 9. If the method invoked was the stepDown() method and value is greater than current value, abort these steps. 10. If the method invoked was the stepUp() method and value is less than current value, abort these steps. 11. Let value as string be the result of running [...] ]] 121910 3 plh 2015-07-09 12:12:15 +0000 merged. Please reopen if further action is needed.