Created attachment 8878927 [details] testcase.htm If you style a <br> with height:500px, it is ignored. But if you use line-height:500px, then the height becomes 500px. This seems wrong, and neither Chrome nor Edge do this.
(I can reproduce in old builds, e.g. Nightly 2014-06-01 (Firefox 32). So, not a regression --> this isn't high-priority enough to make it for 57 at this point, since 57's going to beta channel soon.)
status-firefox57: --- → wontfix
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