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+<!DOCTYPE html>
+<link rel="author" title="David Grogan" href="mailto:dgrogan@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-align-3/#overflow-values">
+<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
+<meta name="assert"
+ content="safe flex-start allows for overflow past the flex-end edge, which is left in the case of wrap-reverse + vertical-lr" />
+
+<style>
+ #reference-overlapped-red {
+ position: absolute;
+ background-color: red;
+ width: 100px;
+ height: 100px;
+ z-index: -1;
+ }
+
+ .flex {
+ display: flex;
+ inline-size: 100px;
+ block-size: 90px;
+ align-content: safe flex-start;
+ flex-wrap: wrap-reverse;
+ writing-mode: vertical-lr;
+ /* Make the green square cover the red square. */
+ translate: 10px 0;
+ }
+
+ .item {
+ flex: 0 0 100px;
+ block-size: 100px;
+ background: green;
+ }
+
+</style>
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.
+</p>
+<div id="reference-overlapped-red"></div>
+
+<div class="flex">
+ <div class="item"></div>
+</div>