/* Space beween function ident and parentless parameter: sin θ */
:is(
  mo.mathup-function-application, /* sin .$ θ */
  /* Prevent sin/cos */
  :not(mfrac, msub, msup, msubsup, munder, mover, munderover)
    > :is(
      .mathup-function-ident,
      :is(msub, msup, msubsup, munder, mover, munderover):has(
          /* log_b n, sin^2 θ */
          > .mathup-function-ident:first-child
        )
  )
)
   + :is(
    mi,
    mn,
    :is(mrow, msub, msup, msubsup, munder, mover, munderover):has(
        /* sin x^2 */
        > :is(mn, mi):first-child
      )
),

/* Space between ident and function ident: a sin */
:not(mfrac, msub, msup, msubsup, munder, mover, munderover)
  > :is(
    mi,
    mo.mathup-function-application, /* cos .$ sin */
    mo.mathup-invisible-times /* a .* sin */
  )
  + :is(
    .mathup-function-ident,
    :is(msub, msup, msubsup, munder, mover, munderover):has(
        /* a sin^2 */
        > .mathup-function-ident:first-child
      )
),

/* Space before fractions: a b/c */
:not(mfrac, msub, msup, msubsup, munder, mover, munderover)
  > :is(
    mi,
    mn,
    mo.mathup-invisible-add, /* a .+ b/c */
    mo.mathup-invisible-times, /* a .* b/c */
    :is(mrow, msub, msup, msubsup, munder, mover, munderover):has(
        /* a^2 b/c */
        > :is(mi, mn):first-child
      )
  )
  + mfrac,

/* Space after fractions: b/c d */
:not(mfrac, msub, msup, msubsup, munder, mover, munderover)
  > mfrac
  + :is(
    mi,
    mn,
    mfrac,
    mroot,
    msqrt,
    mo.mathup-invisible-times, /* b/c .* d */
    :is(mrow, msub, msup, msubsup, munder, mover, munderover):has(
        /* b/c d^2 */
        > :is(mi, mn):first-child
      )
  ) {
  padding-inline-start: 0.35ex;
}

.mathup-enclose-cancel {
  background: linear-gradient(
    to bottom right,
    transparent calc(50% - 0.1ex),
    currentColor calc(50% - 0.05ex),
    currentColor calc(50% + 0.05ex),
    transparent calc(50% + 0.1ex)
  );
}