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+// Test alignment of block equations.
+// Test show rules on equations.
+
+--- math-equation-numbering ---
+#set page(width: 150pt)
+#set math.equation(numbering: "(I)")
+
+We define $x$ in preparation of @fib:
+$ phi.alt := (1 + sqrt(5)) / 2 $ <ratio>
+
+With @ratio, we get
+$ F_n = round(1 / sqrt(5) phi.alt^n) $ <fib>
+
+--- math-equation-font ---
+// Test different font.
+#show math.equation: set text(font: "Fira Math")
+$ v := vec(1 + 2, 2 - 4, sqrt(3), arrow(x)) + 1 $
+
+--- math-equation-show-rule ---
+This is small: $sum_(i=0)^n$
+
+#show math.equation: math.display
+This is big: $sum_(i=0)^n$
+
+--- math-equation-align-unnumbered ---
+// Test unnumbered
+#let eq(alignment) = {
+  show math.equation: set align(alignment)
+  $ a + b = c $
+}
+
+#eq(center)
+#eq(left)
+#eq(right)
+
+#set text(dir: rtl)
+#eq(start)
+#eq(end)
+
+--- math-equation-align-numbered ---
+// Test numbered
+#let eq(alignment) = {
+  show math.equation: set align(alignment)
+  $ a + b = c $
+}
+
+#set math.equation(numbering: "(1)")
+
+#eq(center)
+#eq(left)
+#eq(right)
+
+#set text(dir: rtl)
+#eq(start)
+#eq(end)
+
+--- math-equation-number-align ---
+#set math.equation(numbering: "(1)")
+
+$ a + b = c $
+
+#show math.equation: set align(center)
+$ a + b = c $
+#show math.equation: set align(left)
+$ a + b = c $
+#show math.equation: set align(right)
+$ a + b = c $
+
+#set text(dir: rtl)
+#show math.equation: set align(start)
+$ a + b = c $
+#show math.equation: set align(end)
+$ a + b = c $
+
+--- math-equation-number-align-start ---
+#set math.equation(numbering: "(1)", number-align: start)
+
+$ a + b = c $
+
+#show math.equation: set align(center)
+$ a + b = c $
+#show math.equation: set align(left)
+$ a + b = c $
+#show math.equation: set align(right)
+$ a + b = c $
+
+#set text(dir: rtl)
+#show math.equation: set align(start)
+$ a + b = c $
+#show math.equation: set align(end)
+$ a + b = c $
+
+--- math-equation-number-align-end ---
+#set math.equation(numbering: "(1)", number-align: end)
+
+$ a + b = c $
+
+#show math.equation: set align(center)
+$ a + b = c $
+#show math.equation: set align(left)
+$ a + b = c $
+#show math.equation: set align(right)
+$ a + b = c $
+
+#set text(dir: rtl)
+#show math.equation: set align(start)
+$ a + b = c $
+#show math.equation: set align(end)
+$ a + b = c $
+
+--- math-equation-number-align-left ---
+#set math.equation(numbering: "(1)", number-align: left)
+
+$ a + b = c $
+
+#show math.equation: set align(center)
+$ a + b = c $
+#show math.equation: set align(left)
+$ a + b = c $
+#show math.equation: set align(right)
+$ a + b = c $
+
+#set text(dir: rtl)
+#show math.equation: set align(start)
+$ a + b = c $
+#show math.equation: set align(end)
+$ a + b = c $
+
+--- math-equation-number-align-right ---
+#set math.equation(numbering: "(1)", number-align: right)
+
+$ a + b = c $
+
+#show math.equation: set align(center)
+$ a + b = c $
+#show math.equation: set align(left)
+$ a + b = c $
+#show math.equation: set align(right)
+$ a + b = c $
+
+#set text(dir: rtl)
+#show math.equation: set align(start)
+$ a + b = c $
+#show math.equation: set align(end)
+$ a + b = c $
+
+--- math-equation-number-align-center ---
+// Error: 52-58 expected `start`, `left`, `right`, or `end`, found center
+#set math.equation(numbering: "(1)", number-align: center)
+
+--- math-equation-number-align-center-bottom ---
+// Error: 52-67 expected `start`, `left`, `right`, or `end`, found center
+#set math.equation(numbering: "(1)", number-align: center + bottom)
+
+--- math-equation-number-align-multiline ---
+#set math.equation(numbering: "(1)")
+
+$ p &= ln a b \
+    &= ln a + ln b $
+
+--- math-equation-number-align-multiline-top-start ---
+#set math.equation(numbering: "(1)", number-align: top+start)
+
+$ p &= ln a b \
+    &= ln a + ln b $
+
+--- math-equation-number-align-multiline-bottom ---
+#show math.equation: set align(left)
+#set math.equation(numbering: "(1)", number-align: bottom)
+
+$ q &= ln sqrt(a b) \
+    &= 1/2 (ln a + ln b) $
+
+--- math-equation-number-align-multiline-expand ---
+// Tests that if the numbering's layout box vertically exceeds the box of
+// the equation frame's boundary, the latter's frame is resized correctly
+// to encompass the numbering. #box() below delineates the resized frame.
+//
+// A row with "-" only has a height that's smaller than the height of the
+// numbering's layout box. Note we use pattern "1" here, not "(1)", since
+// the parenthesis exceeds the numbering's layout box, due to the default
+// settings of top-edge and bottom-edge of the TextElem that laid it out.
+#set math.equation(numbering: "1", number-align: top)
+#box(
+$ - &- - \
+  a &= b $,
+fill: silver)
+
+#set math.equation(numbering: "1", number-align: horizon)
+#box(
+$ - - - $,
+fill: silver)
+
+#set math.equation(numbering: "1", number-align: bottom)
+#box(
+$ a &= b \
+  - &- - $,
+fill: silver)
+
+--- issue-numbering-hint ---
+// In this bug, the hint and error messages for an equation
+// being reference mentioned that it was a "heading" and was
+// lacking the proper path.
+#set page(height: 70pt)
+
+$
+    Delta = b^2 - 4 a c
+$ <quadratic>
+
+// Error: 14-24 cannot reference equation without numbering
+// Hint: 14-24 you can enable equation numbering with `#set math.equation(numbering: "1.")`
+Looks at the @quadratic formula.