Revision control
++ <svg xmlns="http://www.w3.org/2000/svg" width="1000" height="390" font-size="25">
++ <!-- SVG allows defining glyph elements with an empty unicode attribute and missing-glyph -->
++ <!-- elements with a non-empty unicode attribute. This file is meant to test for the -->
++ <!-- confusion that may cause. -->
++ <!-- If glyph handling works at all, the table will display arrows either facing up or -->
++ <!-- down. An arrow facing up stands for a passed test, an arrow facing down for a fail. -->
++ <defs>
++ <font xml:id="missing-glyph-with-unicode-mgf">
++ <font-face font-family="missing-glyph-with-unicode-mgf"/>
++ <missing-glyph unicode="a" d="M0 1000L500 0L1000 1000z"/>
++ <glyph unicode="a" d="M0 0L1000 0L500 1000z"/>
++ </font>
++
++ <font xml:id="missing-glyph-with-unicode-mgl">
++ <font-face font-family="missing-glyph-with-unicode-mgl"/>
++ <glyph unicode="a" d="M0 0L1000 0L500 1000z"/>
++ <missing-glyph unicode="a" d="M0 1000L500 0L1000 1000z"/>
++ </font>
++
++ <font xml:id="glyph-without-unicode-mgf">
++ <font-face font-family="glyph-without-unicode-mgf"/>
++ <missing-glyph d="M0 0L1000 0L500 1000z"/>
++ <glyph d="M0 1000L500 0L1000 1000z"/>
++ </font>
++
++ <font xml:id="glyph-without-unicode-mgl">
++ <font-face font-family="glyph-without-unicode-mgl"/>
++ <glyph d="M0 1000L500 0L1000 1000z"/>
++ <missing-glyph d="M0 0L1000 0L500 1000z"/>
++ </font>
++
++ <font xml:id="glyph-empty-unicode-mgf">
++ <font-face font-family="glyph-empty-unicode-mgf"/>
++ <missing-glyph d="M0 0L1000 0L500 1000z"/>
++ <glyph unicode="" d="M0 1000L500 0L1000 1000z"/>
++ </font>
++
++ <font xml:id="glyph-empty-unicode-mgl">
++ <font-face font-family="glyph-empty-unicode-mgl"/>
++ <glyph unicode="" d="M0 1000L500 0L1000 1000z"/>
++ <missing-glyph d="M0 0L1000 0L500 1000z"/>
++ </font>
++
++ <font xml:id="multiple-missing-glyph-mgf">
++ <font-face font-family="multiple-missing-glyph-mgf"/>
++ <missing-glyph d="M0 0L1000 0L500 1000z"/>
++ <missing-glyph d="M0 1000L500 0L1000 1000z"/>
++ <glyph unicode="a" d="M0 1000L500 0L1000 1000z"/>
++ </font>
++
++ <font xml:id="multiple-missing-glyph-mgl">
++ <font-face font-family="multiple-missing-glyph-mgl"/>
++ <glyph unicode="a" d="M0 1000L500 0L1000 1000z"/>
++ <missing-glyph d="M0 0L1000 0L500 1000z"/>
++ <missing-glyph d="M0 1000L500 0L1000 1000z"/>
++ </font>
++
++ <font xml:id="no-missing-glyph">
++ <font-face font-family="no-missing-glyph"/>
++ <glyph unicode="a" d="M0 1000L500 0L1000 1000z"/>
++ </font>
++ </defs>
++
++ <rect x="0" y="0" width="1000" height="390" fill="white"/>
++ <text x="10" y="30" font-family="Arial">(All arrows should face up)</text>
++ <text x="450" y="30" font-family="Arial"><missing-glyph> first</text>
++ <text x="750" y="30" font-family="Arial"><missing-glyph> last</text>
++
++ <text x="10" y="80" font-family="Arial"><missing-glyph> with unicode attribute:</text>
++ <!-- Should show the <glyph>, not the <missing glyph> with the same unicode -->
++ <text x="550" y="80" font-family="missing-glyph-with-unicode-mgf">a</text>
++ <text x="850" y="80" font-family="missing-glyph-with-unicode-mgl">a</text>
++
++ <text x="10" y="130" font-family="Arial"><glyph> without unicode attribute:</text>
++ <!-- Should show the <missing-glyph>, not the <glyph> without unicode -->
++ <text x="550" y="130" font-family="glyph-without-unicode-mgf">a</text>
++ <text x="850" y="130" font-family="glyph-without-unicode-mgl">a</text>
++
++ <text x="10" y="180" font-family="Arial"><glyph> with empty unicode attribute:</text>
++ <!-- Should show the <missing-glyph>, not the <glyph> with empty unicode -->
++ <text x="550" y="180" font-family="glyph-empty-unicode-mgf">a</text>
++ <text x="850" y="180" font-family="glyph-empty-unicode-mgl">a</text>
++
++ <text x="10" y="230" font-family="Arial">multiple <missing-glyph> elements:</text>
++ <!-- Should show the first <missing-glyph> -->
++ <text x="550" y="230" font-family="multiple-missing-glyph-mgf">b</text>
++ <text x="850" y="230" font-family="multiple-missing-glyph-mgl">b</text>
++
++ <text x="10" y="330" font-family="Arial">(No arrow must be drawn)</text>
++ <text x="10" y="380" font-family="Arial">no <missing-glyph> element:</text>
++ <!-- Should show nothing -->
++ <text x="550" y="380" font-family="no-missing-glyph">b</text>
++ </svg>