+!! html/parsoid
+<figure class="mw-default-size" typeof="mw:Image/Thumb" data-mw='{"thumb":"Thumb.png"}'><span><img resource="./File:Foobar.jpg" src="//example.com/images/e/ea/Thumb.png" height="135" width="135"/></span><figcaption>Title</figcaption></figure>
+!! end
+
+!! test
+Manually-specified thumbnail image with explicit link and alt text
+!! options
+parsoid=wt2html,wt2wt,html2html
+!! wikitext
+[[File:Foobar.jpg|thumb=Thumb.png|link=Main_Page|alt=alttext|Title]]
+!! html/php
+<div class="thumb tright"><div class="thumbinner" style="width:137px;"><a href="/wiki/Main_Page" title="Main Page"><img alt="alttext" src="http://example.com/images/e/ea/Thumb.png" width="135" height="135" class="thumbimage" /></a> <div class="thumbcaption"><div class="magnify"><a href="/wiki/File:Foobar.jpg" class="internal" title="Enlarge"><img src="/skins/common/images/magnify-clip.png" width="15" height="11" alt="" /></a></div>Title</div></div></div>
+
+!! html/parsoid
+<figure class="mw-default-size" typeof="mw:Image/Thumb" data-mw='{"thumb":"Thumb.png"}'><a href="Main_Page"><img alt="alttext" resource="./File:Foobar.jpg" src="//example.com/images/e/ea/Thumb.png" height="135" width="135"/></a><figcaption>Title</figcaption></figure>
+!! end
+
+!! test
+Image with frame and link
+!! options
+parsoid=wt2html,wt2wt,html2html
+!! wikitext
+[[File:Foobar.jpg|frame|left|This is a test image [[Main Page]]]]
+!! html/php
+<div class="thumb tleft"><div class="thumbinner" style="width:1943px;"><a href="/wiki/File:Foobar.jpg" class="image"><img alt="" src="http://example.com/images/3/3a/Foobar.jpg" width="1941" height="220" class="thumbimage" /></a> <div class="thumbcaption">This is a test image <a href="/wiki/Main_Page" title="Main Page">Main Page</a></div></div></div>
+
+!! html/parsoid
+<figure class="mw-default-size mw-halign-left" typeof="mw:Image/Frame"><a href="File:Foobar.jpg"><img resource="./File:Foobar.jpg" src="//example.com/images/3/3a/Foobar.jpg" height="220" width="1941"/></a><figcaption>This is a test image <a rel="mw:WikiLink" href="Main_Page">Main Page</a></figcaption></figure>
+!! end
+
+!! test
+Image with frame and link and explicit alt
+!! options
+parsoid=wt2html,wt2wt,html2html
+!! wikitext
+[[Image:Foobar.jpg|frame|left|This is a test image [[Main Page]]|alt=Altitude]]
+!! html/php
+<div class="thumb tleft"><div class="thumbinner" style="width:1943px;"><a href="/wiki/File:Foobar.jpg" class="image"><img alt="Altitude" src="http://example.com/images/3/3a/Foobar.jpg" width="1941" height="220" class="thumbimage" /></a> <div class="thumbcaption">This is a test image <a href="/wiki/Main_Page" title="Main Page">Main Page</a></div></div></div>
+
+!! html/parsoid
+<figure class="mw-default-size mw-halign-left" typeof="mw:Image/Frame"><a href="File:Foobar.jpg"><img alt="Altitude" resource="./File:Foobar.jpg" src="//example.com/images/3/3a/Foobar.jpg" height="220" width="1941"/></a><figcaption>This is a test image <a rel="mw:WikiLink" href="Main_Page">Main Page</a></figcaption></figure>
+!! end
+
+!! test
+Image with wiki markup in implicit alt
+!! options
+parsoid=wt2html,wt2wt,html2html
+!! wikitext
+[[Image:Foobar.jpg|testing '''bold''' in alt]]
+
+[[Image:Foobar.jpg|alt=testing '''bold''' in alt]]
+!! html/php
+<p><a href="/wiki/File:Foobar.jpg" class="image" title="testing bold in alt"><img alt="testing bold in alt" src="http://example.com/images/3/3a/Foobar.jpg" width="1941" height="220" /></a>
+</p><p><a href="/wiki/File:Foobar.jpg" class="image"><img alt="testing bold in alt" src="http://example.com/images/3/3a/Foobar.jpg" width="1941" height="220" /></a>
+</p>
+!! html/parsoid
+<p><span class="mw-default-size" typeof="mw:Image" data-mw="{"caption":"testing '''bold''' in alt"}"><a href="File:Foobar.jpg"><img resource="./File:Foobar.jpg" src="//example.com/images/3/3a/Foobar.jpg" height="220" width="1941"/></a></span></p>
+<p><span class="mw-default-size" typeof="mw:Image"><a href="File:Foobar.jpg"><img alt="testing bold in alt" resource="./File:Foobar.jpg" src="//example.com/images/3/3a/Foobar.jpg" height="220" width="1941"/></a></span></p>
+!! end
+
+###################
+# Image sizing.
+# See https://www.mediawiki.org/wiki/Help:Images#Size_and_frame
+# and https://bugzilla.wikimedia.org/show_bug.cgi?id=62258
+# Foobar has actual size of 1941x220
+# 1. Thumbs & frameless always reduce, can't be enlarged
+# 2. Framed images ignore width; always render at default size.
+# If given a height, they respect height but continue to ignore width.
+# 3. "Unspecified format" and border are the only types which can be
+# enlarged.
+
+!! test
+Image: "unspecified format" and border enlarge
+!! options
+parsoid=wt2html,wt2wt,html2html
+!! wikitext
+[[File:Foobar.jpg|2000px]]
+
+[[File:Foobar.jpg|border|2000px]]
+!! html/php
+<p><a href="/wiki/File:Foobar.jpg" class="image"><img alt="Foobar.jpg" src="http://example.com/images/3/3a/Foobar.jpg" width="2000" height="227" /></a>
+</p><p><a href="/wiki/File:Foobar.jpg" class="image"><img alt="Foobar.jpg" src="http://example.com/images/3/3a/Foobar.jpg" width="2000" height="227" class="thumbborder" /></a>
+</p>
+!! html/parsoid
+<p><span typeof="mw:Image"><a href="File:Foobar.jpg"><img resource="./File:Foobar.jpg" src="//example.com/images/3/3a/Foobar.jpg" height="227" width="2000"/></a></span></p>
+<p><span class="mw-image-border" typeof="mw:Image"><a href="File:Foobar.jpg"><img resource="./File:Foobar.jpg" src="//example.com/images/3/3a/Foobar.jpg" height="227" width="2000"/></a></span></p>
+!! end
+
+!! test
+Image: "unspecified format" and border reduce
+!! options
+parsoid=wt2html,wt2wt,html2html
+!! wikitext
+[[File:Foobar.jpg|1000px]]
+
+[[File:Foobar.jpg|border|1000px]]
+!! html/php
+<p><a href="/wiki/File:Foobar.jpg" class="image"><img alt="Foobar.jpg" src="http://example.com/images/thumb/3/3a/Foobar.jpg/1000px-Foobar.jpg" width="1000" height="113" srcset="http://example.com/images/thumb/3/3a/Foobar.jpg/1500px-Foobar.jpg 1.5x, http://example.com/images/3/3a/Foobar.jpg 2x" /></a>
+</p><p><a href="/wiki/File:Foobar.jpg" class="image"><img alt="Foobar.jpg" src="http://example.com/images/thumb/3/3a/Foobar.jpg/1000px-Foobar.jpg" width="1000" height="113" class="thumbborder" srcset="http://example.com/images/thumb/3/3a/Foobar.jpg/1500px-Foobar.jpg 1.5x, http://example.com/images/3/3a/Foobar.jpg 2x" /></a>
+</p>
+!! html/parsoid
+<p><span typeof="mw:Image"><a href="File:Foobar.jpg"><img resource="./File:Foobar.jpg" src="//example.com/images/3/3a/Foobar.jpg" height="113" width="1000"/></a></span></p>
+<p><span class="mw-image-border" typeof="mw:Image"><a href="File:Foobar.jpg"><img resource="./File:Foobar.jpg" src="//example.com/images/3/3a/Foobar.jpg" height="113" width="1000"/></a></span></p>
+!! end
+
+!! test
+Image: thumbs reduce
+!! options
+parsoid=wt2html,wt2wt,html2html
+!! wikitext
+[[File:Foobar.jpg|thumb|50px]]
+!! html/php
+<div class="thumb tright"><div class="thumbinner" style="width:52px;"><a href="/wiki/File:Foobar.jpg" class="image"><img alt="Foobar.jpg" src="http://example.com/images/thumb/3/3a/Foobar.jpg/50px-Foobar.jpg" width="50" height="6" class="thumbimage" srcset="http://example.com/images/thumb/3/3a/Foobar.jpg/75px-Foobar.jpg 1.5x, http://example.com/images/thumb/3/3a/Foobar.jpg/100px-Foobar.jpg 2x" /></a> <div class="thumbcaption"><div class="magnify"><a href="/wiki/File:Foobar.jpg" class="internal" title="Enlarge"><img src="/skins/common/images/magnify-clip.png" width="15" height="11" alt="" /></a></div></div></div></div>
+
+!! html/parsoid
+<figure typeof="mw:Image/Thumb"><a href="File:Foobar.jpg"><img resource="./File:Foobar.jpg" src="//example.com/images/3/3a/Foobar.jpg" height="6" width="50"/></a></figure>
+!! end
+
+!! test
+Image: thumbs can't be enlarged past original size
+!! options
+parsoid=wt2html,wt2wt,html2html
+!! wikitext
+[[File:Foobar.jpg|thumb|2000px]]
+!! html/php
+<div class="thumb tright"><div class="thumbinner" style="width:1943px;"><a href="/wiki/File:Foobar.jpg" class="image"><img alt="Foobar.jpg" src="http://example.com/images/3/3a/Foobar.jpg" width="1941" height="220" class="thumbimage" /></a> <div class="thumbcaption"><div class="magnify"><a href="/wiki/File:Foobar.jpg" class="internal" title="Enlarge"><img src="/skins/common/images/magnify-clip.png" width="15" height="11" alt="" /></a></div></div></div></div>
+
+!! html/parsoid
+<figure typeof="mw:Image/Thumb"><a href="File:Foobar.jpg"><img resource="./File:Foobar.jpg" src="//example.com/images/3/3a/Foobar.jpg" height="220" width="1941"/></a></figure>