Implimentation

Key:

x in the p5 canvas column means that the element is part of the p5 canvas element.
g in the p5 canvas column means that the element is a global part of p5 even though it is not part of the canvas.
x in the MyCanvas column means that the element is at least partially emplimented in MyCanvas.
r in the MyCanvas column means that it seems required to be part of MyCanvas in a multi-canvas page because the element might be different in one canvas than another. For example, noFill might be used in one canvas but another needs fill.

element	Implemented in p5 canvas	Implement in MyCanvas
Strings (p5 canvas has 10 strings, 50% implemented)
_textFont	x	x r
_textStyle	x	x r
_textAlign	x	x r
_textBaseline	x
_rectMode	x	x r
_ellipseMode	x	x r
_colorMode	g	x r
_imageMode	x
_cachedStrokeStyle	x
_cachedFillStyle	x
_cachedBlendMode	x
_id		x r
Numbers (p5 canvas has 5 numbers, 60% implemented 100% of the non "_" numbers)
width	x	x r
height	x	x r
_textSize	x	x r
_textLeading	x
_curveTightness	x
_strokeWeight		x r
_textWeight		x r
_textStrokeWeight		x r
functions (p5 canvas has 93 functions, 52% implemented 69% of the non "_" related functions)
_applyDefaults	x
resizeCanvas	x	x
background	x	x
clear	x	x
fill	x	x
stroke	x	x
erase	x
noErase	x
image	x	x
_getTintedImageCanvas	x
blendMode	x
blend function	x
_getPixel	x
loadPixels	x
set	x
updatePixels	x
_acuteArcToBezier	x
arc	x	x
ellipse	x	x
line	x	x
point	x	x
quad	x	x
rect	x	x
triangle	x	x
endShape	x	x
strokeCap	x	x
strokeJoin	x
strokeWeight	x	x
_getFill	x
_setFill	x
_getStroke	x
_setStroke	x
bezier	x	x
curve	x
_doFillStrokeClose	x
applyMatrix	x	x
resetMatrix	x	x
rotate	x	x
scale	x	x
translate	x	x
text	x	x
_renderText	x
textWidth	x
_applyTextProperties	x
push	x
pop	x
get	x
textLeading	x
textSize	x	x
textStyle	x	x
textAscent	x
textDescent	x
textAlign	x	x
_isOpenType	x
_updateTextMetrics	x
parent	x	x
id	x	x
class	x
mousePressed	x	x
doubleClicked	x	x
mouseWheel	x	x
mouseReleased	x	x
mouseClicked	x	x
mouseMoved	x	x
mouseOver	x	x
mouseOut	x	x
touchStarted	x	x
touchMoved	x	x
touchEnded	x	x
dragOver	x	x
dragLeave	x	x
_setProperty	x
changed	x
input	x
addClass	x
removeClass	x
hasClass	x
toggleClass	x
child	x	x
center	x	x
html	x	x
position	x	x
_translate	x
_rotate	x
style	x	x
attribute	x
removeAttribute	x
value	x
show	x	x
hide	x	x
size	x
remove	x
drop	x	x
color	g	x
colorMode	g	x r
loadImage	g	x
noFill	g	x r
noStroke	g	x r
rectMode	g	x r
ellipseMode	g	x r
textFont	g	x r
square	g	x
circle	g	x
bezierPoint	g	x
bezierTangent	g	x
bezierPoint	g	x
_decrementPreload	g	x
beginShape	g	x r
vertex	g	x r
convertImageToMyCanvas		x
keyDown		x
keyUp		x
objects (p5 canvas has 9 objects, 56% implemented 100% of the non "_" objects)
elt	x	x
_pixelsState	x
_pInst	x	x
_events	x	x
canvas	x	x
_textAscent	x (null)
_textDescent	x (null)
_tint	x (null)
drawingContext	x	x
_backgoundColor		x r
_fillColor		x r
_strokeColor		x r
touches	g	x r
_colorMaxes	g	x r
boolean (p5 canvas has 6 boolean variables, 33% implemented 100% of the non "_" objects)
_isMainCanvas	x	x
_doStroke	x
_doFill	x
_strokeSet	x
_fillSet	x
_dragDisabled	x	x
mouseIsPressed	g	x
keyIsPressed	g	x
isOver		x r
_strokeText		x
_dragStarted		x

By this count, there are non "_" elements either in a p5 canvas or are related but global. MyCanvas implements (at least in part) 72 or 72% of them.

James Brink, 5/26/2020