<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">18 нояб. 2015 г., в 11:50, Simon Fraser <<a href="mailto:simon.fraser@apple.com" class="">simon.fraser@apple.com</a>> написал(а):</div><br class="Apple-interchange-newline"><div class=""><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">There are some well-understood reasons why a test might not exactly match its reference. One is that the test uses compositing layers to do clipping, but the reference just clips with drawing, and these are not expected to give a pixel-perfect match.</div><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><br class=""></div><div class="" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">I proposed a way to allow a test to specify a custom tolerance in <a href="https://bugs.webkit.org/show_bug.cgi?id=149828" class="">https://bugs.webkit.org/show_bug.cgi?id=149828</a>. If we had this, it would allow me to fix <a href="https://bugs.webkit.org/show_bug.cgi?id=142258" class="">142258</a> and <a href="https://bugs.webkit.org/show_bug.cgi?id=146523" class="">146523</a>.</div></div></blockquote><br class=""></div><div>Bug 142258 also serves as an example for why we shouldn't do this. Both known reasons for it are actual bugs that needed to be discovered, and need to be fixed.</div><div class=""><br class=""></div><div class="">What are the causes for flakiness in bug 146523?</div><br class=""><div class="">
<div class="">- Alexey</div>
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