Zacky Ma<p>Seems this is a browser bug (but Edge stable and Safari TP both have the same issue) or maybe I don't understand `position-area` right, but if you use CSSOM to set multiple values to `position-area` with one of them being `span-all`, `span-all` would be ignored/removed. <a href="https://m.marchbox.com/tags/CSS" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>CSS</span></a> <a href="https://m.marchbox.com/tags/CSSOM" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>CSSOM</span></a> <a href="https://m.marchbox.com/tags/CSSAnchorPositioning" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>CSSAnchorPositioning</span></a></p><p><a href="https://codepen.io/marchbox/pres/wBBryoz" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">codepen.io/marchbox/pres/wBBry</span><span class="invisible">oz</span></a></p>