diff --git a/wpt/data-tests.js b/wpt/data-tests.js
index 230b3c9..831b745 100644
--- a/wpt/data-tests.js
+++ b/wpt/data-tests.js
@@ -1,14 +1,16 @@
 // This file was automatically generated by extract.sh. Do not edit.
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   "css-styling" : "presentation-markup/direction/direction-006.html,presentation-markup/direction/direction-007.html,presentation-markup/direction/direction-008.html,presentation-markup/direction/direction-009.html,presentation-markup/direction/direction-010.html,presentation-markup/direction/direction-overall.html,presentation-markup/direction/direction-token.html,presentation-markup/fractions/frac-color-001.html,presentation-markup/fractions/frac-color-002.html,presentation-markup/fractions/frac-visibility-001.html,relations/css-styling/color-001.html,relations/css-styling/color-002.html,relations/css-styling/color-003.html,relations/css-styling/color-004.html,relations/css-styling/display-1.html,relations/css-styling/display-contents.html,relations/css-styling/displaystyle-1.html,relations/css-styling/displaystyle-2.html,relations/css-styling/dynamic-dir-1.html,relations/css-styling/ignored-properties-001.html,relations/css-styling/lengths-1.html,relations/css-styling/lengths-2.html,relations/css-styling/mathsize-attribute-css-keywords.html,relations/css-styling/mathsize-attribute-legacy-values.html,relations/css-styling/mathsize-attribute.html,relations/css-styling/mathvariant-auto.html,relations/css-styling/mathvariant-bold-fraktur.html,relations/css-styling/mathvariant-bold-italic.html,relations/css-styling/mathvariant-bold-sans-serif.html,relations/css-styling/mathvariant-bold-script.html,relations/css-styling/mathvariant-bold.html,relations/css-styling/mathvariant-case-sensitivity.html,relations/css-styling/mathvariant-double-struck.html,relations/css-styling/mathvariant-fraktur.html,relations/css-styling/mathvariant-initial.html,relations/css-styling/mathvariant-italic.html,relations/css-styling/mathvariant-looped.html,relations/css-styling/mathvariant-monospace.html,relations/css-styling/mathvariant-sans-serif-bold-italic.html,relations/css-styling/mathvariant-sans-serif-italic.html,relations/css-styling/mathvariant-sans-serif.html,relations/css-styling/mathvariant-script.html,relations/css-styling/mathvariant-stretched.html,relations/css-styling/mathvariant-tailed.html,relations/css-styling/visibility-001.html,relations/css-styling/visibility-002.html,relations/css-styling/visibility-003.html,relations/css-styling/visibility-004.html,relations/html5-tree/class-1.html,relations/html5-tree/color-attributes-1.html,relations/html5-tree/display-1.html,relations/html5-tree/tabindex-001.html,relations/html5-tree/unique-identifier-3.html",
   "definition-of-space-like-elements" : "presentation-markup/operators/embellished-operator-001.html,presentation-markup/operators/embellished-operator-002.html,presentation-markup/spaces/space-like-001.html,presentation-markup/spaces/space-like-002.html,presentation-markup/spaces/space-like-003.html,presentation-markup/spaces/space-like-004.html",
+  "dictionary-based-attributes" : "presentation-markup/operators/operator-dictionary-001.html",
   "dom-and-javascript" : "presentation-markup/fractions/frac-created-dynamically-2.html,presentation-markup/fractions/frac-created-dynamically-3.html,presentation-markup/fractions/frac-created-dynamically.html,presentation-markup/operators/mo-form-dynamic.html,presentation-markup/operators/mo-movablelimits-dynamic.html,relations/css-styling/dynamic-dir-1.html,relations/html5-tree/class-2.html,relations/html5-tree/clipboard-event-handlers.tentative.html,relations/html5-tree/css-inline-style-dynamic.tentative.html,relations/html5-tree/css-inline-style-interface.tentative.html,relations/html5-tree/dynamic-1.html,relations/html5-tree/href-click-1.html,relations/html5-tree/href-click-2.html,relations/html5-tree/href-click-3.html,relations/html5-tree/html-or-foreign-element-interfaces.tentative.html,relations/html5-tree/math-global-event-handlers.tentative.html,relations/html5-tree/unique-identifier-2.html",
   "embellished-operators" : "presentation-markup/direction/direction-007.html,presentation-markup/direction/direction-008.html,presentation-markup/operators/embellished-operator-001.html,presentation-markup/operators/embellished-operator-002.html",
   "enclose-expression-inside-notation-menclose" : "presentation-markup/menclose/legacy-menclose-radical-notation.html,presentation-markup/mrow/inferred-mrow-baseline.html,presentation-markup/mrow/inferred-mrow-stretchy.html,presentation-markup/mrow/legacy-mstyle-attributes.html,relations/css-styling/color-004.html,relations/css-styling/visibility-004.html",
+  "enlivening-expressions" : "presentation-markup/mrow/legacy-mrow-like-elements-001.html,presentation-markup/mrow/legacy-mrow-like-elements-002.html",
   "error-message-merror" : "presentation-markup/mrow/inferred-mrow-baseline.html,presentation-markup/mrow/inferred-mrow-stretchy.html",
   "fraction-with-nonzero-line-thickness" : "relations/css-styling/color-002.html,relations/css-styling/visibility-002.html",
   "fractions-mfrac" : "presentation-markup/direction/direction-008.html,presentation-markup/fractions/frac-1.html,presentation-markup/fractions/frac-bar-001.html,presentation-markup/fractions/frac-bar-002.html,presentation-markup/fractions/frac-color-001.html,presentation-markup/fractions/frac-color-002.html,presentation-markup/fractions/frac-created-dynamically-2.html,presentation-markup/fractions/frac-created-dynamically-3.html,presentation-markup/fractions/frac-created-dynamically.html,presentation-markup/fractions/frac-default-padding.html,presentation-markup/fractions/frac-linethickness-001.html,presentation-markup/fractions/frac-linethickness-002.html,presentation-markup/fractions/frac-linethickness-003.html,presentation-markup/fractions/frac-linethickness-004.html,presentation-markup/fractions/frac-mrow-001.html,presentation-markup/fractions/frac-numalign-denomalign-001.html,presentation-markup/fractions/frac-parameters-1.html,presentation-markup/fractions/frac-parameters-2.html,presentation-markup/fractions/frac-parameters-gap-001.html,presentation-markup/fractions/frac-parameters-gap-002.html,presentation-markup/fractions/frac-parameters-gap-003.html,presentation-markup/fractions/frac-parameters-gap-004.html,presentation-markup/fractions/frac-parameters-gap-005.html,presentation-markup/fractions/frac-parameters-gap-006.html,presentation-markup/fractions/frac-rendering-from-in-flow.html,presentation-markup/fractions/frac-visibility-001.html,presentation-markup/mrow/legacy-mstyle-attributes.html,relations/css-styling/displaystyle-011.html,relations/css-styling/displaystyle-014.html",
@@ -19,13 +21,14 @@ var dataTests = {
   "legacy-mathml-style-attributes" : "relations/css-styling/attribute-mapping-001.html,relations/css-styling/displaystyle-014.html,relations/css-styling/lengths-1.html,relations/css-styling/lengths-2.html,relations/css-styling/mathbackground-001.html,relations/css-styling/mathbackground-002.html,relations/css-styling/mathbackground-003.html,relations/css-styling/mathbackground-004.html,relations/css-styling/mathcolor-001.html,relations/css-styling/mathcolor-002.html,relations/css-styling/mathcolor-003.html,relations/css-styling/mathcolor-004.html,relations/css-styling/mathsize-attribute-css-keywords.html,relations/css-styling/mathsize-attribute-legacy-values.html,relations/css-styling/mathsize-attribute.html,relations/html5-tree/color-attributes-1.html",
   "making-sub-expressions-invisible-mphantom" : "presentation-markup/mrow/inferred-mrow-baseline.html,presentation-markup/mrow/inferred-mrow-stretchy.html",
   "new-text-transform-values" : "../css/css-text/text-transform/math/text-transform-math-auto-001.tentative.html,../css/css-text/text-transform/math/text-transform-math-auto-002.tentative.html,../css/css-text/text-transform/math/text-transform-math-bold-001.tentative.html,../css/css-text/text-transform/math/text-transform-math-bold-fraktur-001.tentative.html,../css/css-text/text-transform/math/text-transform-math-bold-italic-001.tentative.html,../css/css-text/text-transform/math/text-transform-math-bold-sans-serif-001.tentative.html,../css/css-text/text-transform/math/text-transform-math-bold-script-001.tentative.html,../css/css-text/text-transform/math/text-transform-math-double-struck-001.tentative.html,../css/css-text/text-transform/math/text-transform-math-fraktur-001.tentative.html,../css/css-text/text-transform/math/text-transform-math-initial-001.tentative.html,../css/css-text/text-transform/math/text-transform-math-italic-001.tentative.html,../css/css-text/text-transform/math/text-transform-math-looped-001.tentative.html,../css/css-text/text-transform/math/text-transform-math-monospace-001.tentative.html,../css/css-text/text-transform/math/text-transform-math-sans-serif-001.tentative.html,../css/css-text/text-transform/math/text-transform-math-sans-serif-bold-italic-001.tentative.html,../css/css-text/text-transform/math/text-transform-math-sans-serif-italic-001.tentative.html,../css/css-text/text-transform/math/text-transform-math-script-001.tentative.html,../css/css-text/text-transform/math/text-transform-math-stretched-001.tentative.html,../css/css-text/text-transform/math/text-transform-math-tailed-001.tentative.html,relations/css-styling/mathvariant-auto.html,relations/css-styling/mathvariant-bold-fraktur.html,relations/css-styling/mathvariant-bold-italic.html,relations/css-styling/mathvariant-bold-sans-serif.html,relations/css-styling/mathvariant-bold-script.html,relations/css-styling/mathvariant-bold.html,relations/css-styling/mathvariant-case-sensitivity.html,relations/css-styling/mathvariant-double-struck.html,relations/css-styling/mathvariant-fraktur.html,relations/css-styling/mathvariant-initial.html,relations/css-styling/mathvariant-italic.html,relations/css-styling/mathvariant-looped.html,relations/css-styling/mathvariant-monospace.html,relations/css-styling/mathvariant-sans-serif-bold-italic.html,relations/css-styling/mathvariant-sans-serif-italic.html,relations/css-styling/mathvariant-sans-serif.html,relations/css-styling/mathvariant-script.html,relations/css-styling/mathvariant-stretched.html,relations/css-styling/mathvariant-tailed.html",
-  "operator-dictionary" : "relations/css-styling/displaystyle-015.html",
-  "operator-fence-separator-or-accent-mo" : "presentation-markup/direction/direction-007.html,presentation-markup/mrow/inferred-mrow-stretchy.html,presentation-markup/mrow/legacy-mstyle-attributes.html,presentation-markup/operators/mo-axis-height-1.html,presentation-markup/operators/mo-form-dynamic.html,presentation-markup/operators/mo-form-fallback.html,presentation-markup/operators/mo-form-minus-plus.html,presentation-markup/operators/mo-form.html,presentation-markup/operators/mo-movablelimits-default.html,presentation-markup/operators/mo-movablelimits-dynamic.html,presentation-markup/operators/mo-movablelimits-from-in-flow.html,presentation-markup/operators/mo-movablelimits.html,presentation-markup/operators/mo-paint-lspace-rspace.html,presentation-markup/spaces/space-like-001.html,presentation-markup/spaces/space-like-002.html,presentation-markup/spaces/space-like-003.html,presentation-markup/spaces/space-like-004.html,relations/css-styling/displaystyle-011.html,relations/css-styling/displaystyle-012.html,relations/css-styling/displaystyle-013.html,relations/css-styling/displaystyle-014.html,relations/css-styling/displaystyle-015.html",
+  "operator-dictionary" : "presentation-markup/operators/operator-dictionary-001.html,relations/css-styling/displaystyle-015.html",
+  "operator-fence-separator-or-accent-mo" : "presentation-markup/direction/direction-007.html,presentation-markup/mrow/inferred-mrow-stretchy.html,presentation-markup/mrow/legacy-mstyle-attributes.html,presentation-markup/operators/mo-axis-height-1.html,presentation-markup/operators/mo-form-dynamic.html,presentation-markup/operators/mo-form-fallback.html,presentation-markup/operators/mo-form-minus-plus.html,presentation-markup/operators/mo-form.html,presentation-markup/operators/mo-movablelimits-default.html,presentation-markup/operators/mo-movablelimits-dynamic.html,presentation-markup/operators/mo-movablelimits-from-in-flow.html,presentation-markup/operators/mo-movablelimits.html,presentation-markup/operators/mo-paint-lspace-rspace.html,presentation-markup/operators/operator-dictionary-001.html,presentation-markup/spaces/space-like-001.html,presentation-markup/spaces/space-like-002.html,presentation-markup/spaces/space-like-003.html,presentation-markup/spaces/space-like-004.html,relations/css-styling/displaystyle-011.html,relations/css-styling/displaystyle-012.html,relations/css-styling/displaystyle-013.html,relations/css-styling/displaystyle-014.html,relations/css-styling/displaystyle-015.html",
   "prescripts-and-tensor-indices-mmultiscripts" : "relations/css-styling/displaystyle-011.html",
   "radical-symbol" : "relations/css-styling/color-003.html,relations/css-styling/visibility-003.html",
   "radicals-msqrt-mroot" : "presentation-markup/mrow/inferred-mrow-baseline.html,presentation-markup/mrow/inferred-mrow-stretchy.html,presentation-markup/radicals/radical-rendering-from-in-flow.html,presentation-markup/radicals/root-parameters-1.html,relations/css-styling/displaystyle-011.html",
-  "semantics-and-presentation" : "relations/css-styling/mathbackground-004.html,relations/css-styling/mathcolor-004.html",
+  "semantics-and-presentation" : "presentation-markup/mrow/legacy-mrow-like-elements-001.html,presentation-markup/mrow/legacy-mrow-like-elements-002.html,relations/css-styling/mathbackground-004.html,relations/css-styling/mathcolor-004.html",
   "space-mspace" : "presentation-markup/mrow/legacy-mstyle-attributes.html,presentation-markup/spaces/mspace-children.html,presentation-markup/spaces/space-1.html,presentation-markup/spaces/space-2.html,relations/css-styling/lengths-1.html,relations/css-styling/lengths-2.html",
+  "stretchy-operator-axis" : "presentation-markup/operators/operator-dictionary-001.html",
   "string-literal-ms" : "presentation-markup/direction/direction-009.html,presentation-markup/mrow/legacy-mstyle-attributes.html",
   "style-change-mstyle" : "presentation-markup/direction/direction-010.html,presentation-markup/direction/direction-overall.html,presentation-markup/mrow/inferred-mrow-baseline.html,presentation-markup/mrow/inferred-mrow-stretchy.html,presentation-markup/mrow/legacy-mstyle-attributes.html,relations/css-styling/displaystyle-011.html,relations/css-styling/displaystyle-012.html,relations/css-styling/displaystyle-013.html,relations/css-styling/displaystyle-014.html,relations/css-styling/displaystyle-015.html,relations/css-styling/mathbackground-002.html,relations/css-styling/mathcolor-002.html",
   "subscripts-and-superscripts-msub-msup-msubsup" : "presentation-markup/scripts/cramped-001.html,presentation-markup/scripts/subsup-1.html,presentation-markup/scripts/subsup-2.html,presentation-markup/scripts/subsup-3.html,presentation-markup/scripts/subsup-4.html,presentation-markup/scripts/subsup-5.html,presentation-markup/scripts/subsup-parameters-1.html,presentation-markup/scripts/subsup-parameters-2.html,relations/css-styling/displaystyle-011.html",