テスト　ショートコードギャラリー

ギャラリーショートコードのエディタでのソースは以下の通り

HTML4のギャラリーじゃないの

<div class="editor-block-list__block-edit" tabindex="0" aria-label="Block: Classic Text">
....
	<div class="gallery gallery-columns-3">
		<dl class="gallery-item">
			<dt class="gallery-icon"><img src="" width="150" height="150"alt=""></dt>
		</dl>
		<dl class="gallery-item">
			<dt class="gallery-icon"><img src="" width="150" height="150"alt=""></dt>
		</dl>
		<dl class="gallery-item">
			<dt class="gallery-icon"><img src="" width="150" height="150"alt=""></dt>
			<dd class="wp-caption-text gallery-caption">caption</dd>
		</dl>
		<br style="clear: both;">
	</div>
	<span class="wpview-end"></span>
....
</div>

フロント側

<div id="gallery-1" class="gallery galleryid-48431 gallery-columns-3 gallery-size-medium">
	<figure class="gallery-item" tabindex="0">
		<div class="gallery-icon landscape">
			<a href="">
				<img width="" height="" src="" class="attachment-medium size-medium" alt="" srcset="" sizes="">
			</a>
		</div>
	</figure>
	<figure class="gallery-item" tabindex="0">
		<div class="gallery-icon landscape">
			<a href="">
				<img width="" height="" src="" class="attachment-medium size-medium" alt="" srcset="" sizes="">
			</a>
		</div>
	</figure>
	<figure class="gallery-item" tabindex="0">
		<div class="gallery-icon portrait">
			<a href="">
				<img width="" height="" src="" class="attachment-medium size-medium" alt="" aria-describedby="gallery-1-48307" srcset="" sizes="">
			</a>
		</div>
		<figcaption class="wp-caption-text gallery-caption" id="gallery-1-48307" tabindex="0">caption</figcaption>
	</figure>
</div>