void pikchr_to_html(
  Blob *ob,                     /* Write the generated SVG here */
  const char *zSrc, int nSrc,   /* The Pikchr source text */
  const char *zArg, int nArg    /* Addition arguments */
){
  int w = 0, h = 0;
  char *zIn = fossil_strndup(zSrc, nSrc);
  char *zOut = pikchr(zIn, "pikchr", PIKCHR_INCLUDE_SOURCE, &w, &h);
  fossil_free(zIn);
  if( w>0 && h>0 ){
    const char *zNonce = safe_html_nonce(1);
    Blob css;
    blob_init(&css,0,0);
    blob_appendf(&css,"max-width:%dpx;",w);
    blob_append(ob, zNonce, -1);