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+<!--
+ The following tests an anomaly in the SMIL Animation spec.
+
+ SMILANIM 3.6.8 says:
+
+ Thus the strict definition of the first acceptable interval for the element
+ is the first interval that ends after the document begins.
+
+ This is then demonstrated in pseudocode.
+
+ However, it is contradicted by a statement just before the first that says:
+
+ The element has one or more intervals defined that begin and end before the
+ document begins (before 0). These are filtered out of the model.
+
+ So there is some ambiguity about intervals that end at time zero. However, the
+ first statement seems more authorative ("the strict definition") and the
+ second statement does not explicitly say that intervals that end at t=0 are
+ not filtered. Furthermore, the pseudocode is in agreement with the first
+ statement so we conclude that if an interval finishes at time zero it is not
+ an acceptable interval and is filtered out.
+
+ The following animation sets up such an interval, that, based on its
+ repeatCount has an active duration of 1s, producing an interval of (-1s, 0s).
+ Therefore this interval should be filtered out and no animation effect should
+ be produced. The circle should remain at position 0 (the first marker). If the
+ interval is not correctly filtered out it will be at position 100 (the second
+ marker).
+
+ We include this test as a regression test so that no one is tempted to "fix"
+ this behaviour.
+
+ Note that this behaviour persists even in SMIL 3 (including the ambiguity
+ noted above).
+ See http://www.w3.org/TR/SMIL3/smil-timing.html#Timing-BeginEnd-LC-Start
+ -->
+<svg xmlns="http://www.w3.org/2000/svg">
+ <g transform="translate(50 50)">
+ <circle r="40" style="fill: yellow; stroke: black; stroke-width: 1">
+ <animate attributeName="cx" attributeType="XML" fill="freeze"
+ values="0; 200" dur="2s" begin="-1s" repeatCount="0.5"/>
+ </circle>
+ <path d="M0 -10v20" stroke="blue"/>
+ <path d="M100 -10v20" stroke="blue"/>
+ <path d="M200 -10v20" stroke="blue"/>
+ </g>
+</svg>