<mphantom> is implemented for compatibility with full MathML. Authors whose only target is MathML Core are encouraged to use CSS for styling.
+
+
Enclose Expression Inside Notation <menclose>
+
Can this element be simplified?
+
OpenType MATH values for menclose notations?
+
+ The
+ <menclose>
+ element renders its content inside the enclosing notation.
+ It accepts the attributes described in
+ as well as the
+ following attribute:
+
+ The
+ notation
+ attribute, if present, must have a value that is a
+ set of space-separated tokens.
+ A token value that is an
+ ASCII case-insensitive
+ match to one of
+ left,
+ right,
+ top,
+ bottom,
+ box,
+ roundedbox,
+ actuarial,
+ madruwb,
+ horizontalstrike,
+ verticalstrike
+ updiagonalstrike,
+ downdiagonalstrike,
+ longdiv,
+ circle is handled as described in the following
+ subsections. Any other token value is ignored. If the
+ notation attribute is absent then it is treated as
+ equal to longdiv.
+
+
+ If the notation attribute is empty or equal to the
+ MathML3 value radical then the notation
+ attribute is valid and the
+ <menclose> element will be rendered without
+ any notation rather than with the default longdiv
+ notation.
+
+
+ If the <menclose> element does not have its
+ computed
+ display property equal to math
+ then it is laid out according to the CSS specification where
+ the corresponding value is described.
+ Otherwise, the layout below is performed.
+
+
+ The notations must only be painted if the
+ visibility of
+ the <menclose> element is visible.
+ In that case, the notations must be painted with the
+ color
+ of the <menclose> element.
+
+ ξ8 is the notation used in [[?TEXBOOK]] for the
+ default rule thickness.
+
+
+
Multiple notations
+
+ If the notation attribute contains the
+ box value,
+ then it is treated as it was replaced with the set of values
+ left right top bottom, removing duplicates values
+ with the other of the notations, if any.
+ Similarly, actuarial and
+ madruwb notations are respectively treated as
+ equivalent to right top and
+ and right bottom.
+
+
Specify in which order the notations are painted?
+
+ The layout of other individual notation is explained in the
+ following sections. In general when the notation
+ attribute contains multiple
+ values, each algorithm is applied individually to obtain
+ boxes B1, B2, ... Bn
+ corresponding to their content. The layout
+ of the <menclose> element is then performed
+ as follows:
+
+
+
+ For each layout Bi, sleft,i is the
+ line-left offset of
+ the B and sright,i is
+ (inline size of Bi − line-right offset of B).
+ sleft (respectively sright) is the maximum
+ of the sleft,i over
+ (respectively sleft,i) over all the i. Then
+ the inline size is sleft +
+ the inline size of B + sright.
+
+ The above description explains how to take the union of all
+ the notations. In the layout of Bi,
+ B is placed at line-left position sleft,i and
+ its alphabetic baseline is at line-over position the line-ascent of
+ Bi. So the final shifts are compatible for
+ the box B: It will be at line-left position sleft and
+ its alphabetic baseline aligned with the alphabetic baseline.
+
+
+
+
Border-like notations
+
+
+
For the left notation, a bar is drawn
+ on the line-left side along the block axis
+ as shown on .
+
+
+
+ Box model for the left
+ notation of the <menclose> element
+
+
+ The right notation is handled the same as the
+ left notation,
+ but with the bar placed on the line-right side. The block
+ metrics,
+ min-content inline size, max-content inline size
+ and inline size of the content are the same.
+
+
+ The inline size of the bar is ξ8,
+ its line-left offset is the inline size −
+ 2ξ8 and the line-left offset of B is 0.
+
+
+
+
For the top notation, a bar is drawn
+ on the line-over side along the inline axis
+ as shown on .
+
+
+
+
+ Box model for the top
+ notation of the <menclose> element
+
+
+ For the horizontalstrike notation,
+ the metrics are the same as B.
+ A bar of inline size the inline size of the content and
+ of block size ξ8 is drawn
+ at line-over position minus half ξ8.
+ See .
+
+
+
+ Box model for the horizontalstrike
+ notation of the <menclose> element
+
+
+
+
+ For the verticalstrike notation,
+ the metrics are the same as B.
+ A bar of inline size ξ8 and
+ of block size the block size of the content is drawn
+ at line-left position
+ half the inline size of the content minus half ξ8.
+
+ Using terminology from [[SVG]],
+ the bar is drawn with a line
+ of thickness ξ8 going from the
+ line-underline-left corner of B
+ to the line-over line-right corner of B with
+ stroke-linecap set to butt.
+
+
+
+ Box model for the updiagonalstrike
+ notation of the <menclose> element
+
+
+
+
+ For the downdiagonalstrike notation,
+ a bar is drawn
+ going from the line-left line-over corner to the
+ line-rightline-under corner. The metrics are the same as
+ for the updiagonalstrike notation.
+
+
+
+
+
+
Enclosing notations
+
+
+
+ The roundedbox notation is drawn as
+ shown on .
+
+
+
+ Box model for the roundedbox
+ notation of the <menclose> element
+
+
+ B is placed so that its alphabetic baseline is the alphabetic baseline and
+ its line-left offset is 5ξ8.
+ If B' is the ink box B expanded on each side by
+ ½7ξ8 then using terminology from [[SVG]],
+ a rounded rectangle is drawn on B'
+ with parameters rx, ry and
+ stroke-width set to 3ξ8.
+
+
+
+
+ The longdiv notation is drawn similarly to the
+ <msqrt> element
+ ()
+ except that the CSS
+ direction
+ is ignored and U+221A SQUARE ROOT is replaced with
+ U+0029 RIGHT PARENTHESIS. The rule thickness is ξ8,
+ the gap between content and overbar is 3ξ8 and the
+ extra ascender is ξ8.
+
+
+
+
+ The circle notation is drawn as shown
+ on .
+ Given the ink box of width w and height h, an ellipse is drawn using
+ the axes of symmetry of this ink box, the radii
+ w x ½√2, h x ½√2 and thickness ξ8.
+ Space of ξ8 is added each side of the ellipse's ink
+ box.
+
+ 
+ 
+ 
+ 
+ 
+