This is a testharness.js-based test.
Found 78 tests; 54 PASS, 24 FAIL, 0 TIMEOUT, 0 NOTRUN.
PASS DOMMatrix stringifier: identity (2d) 
PASS DOMMatrix stringifier: identity (3d) 
PASS DOMMatrix stringifier: NaN (2d) 
PASS DOMMatrix stringifier: NaN (3d) 
PASS DOMMatrix stringifier: Infinity (2d) 
PASS DOMMatrix stringifier: Infinity (3d) 
PASS DOMMatrix stringifier: -Infinity (2d) 
PASS DOMMatrix stringifier: -Infinity (3d) 
PASS DOMMatrix stringifier: 1/3 (2d) 
PASS DOMMatrix stringifier: 1/3 (3d) 
PASS DOMMatrix stringifier: 1/300000 (2d) 
PASS DOMMatrix stringifier: 1/300000 (3d) 
PASS DOMMatrix stringifier: 1/300000000 (2d) 
PASS DOMMatrix stringifier: 1/300000000 (3d) 
PASS DOMMatrix stringifier: 100000 + (1/3) (2d) 
PASS DOMMatrix stringifier: 100000 + (1/3) (3d) 
PASS DOMMatrix stringifier: Math.pow(2, 53) + 1 (2d) 
PASS DOMMatrix stringifier: Math.pow(2, 53) + 1 (3d) 
PASS DOMMatrix stringifier: Math.pow(2, 53) + 2 (2d) 
PASS DOMMatrix stringifier: Math.pow(2, 53) + 2 (3d) 
PASS DOMMatrix stringifier: Number.MAX_VALUE (2d) 
PASS DOMMatrix stringifier: Number.MAX_VALUE (3d) 
PASS DOMMatrix stringifier: Number.MIN_VALUE (2d) 
PASS DOMMatrix stringifier: Number.MIN_VALUE (3d) 
PASS DOMMatrix stringifier: throwing getters (2d) 
PASS DOMMatrix stringifier: throwing getters (3d) 
PASS DOMMatrixReadOnly stringifier: identity (2d) 
PASS DOMMatrixReadOnly stringifier: identity (3d) 
PASS DOMMatrixReadOnly stringifier: NaN (2d) 
PASS DOMMatrixReadOnly stringifier: NaN (3d) 
PASS DOMMatrixReadOnly stringifier: Infinity (2d) 
PASS DOMMatrixReadOnly stringifier: Infinity (3d) 
PASS DOMMatrixReadOnly stringifier: -Infinity (2d) 
PASS DOMMatrixReadOnly stringifier: -Infinity (3d) 
PASS DOMMatrixReadOnly stringifier: 1/3 (2d) 
PASS DOMMatrixReadOnly stringifier: 1/3 (3d) 
PASS DOMMatrixReadOnly stringifier: 1/300000 (2d) 
PASS DOMMatrixReadOnly stringifier: 1/300000 (3d) 
PASS DOMMatrixReadOnly stringifier: 1/300000000 (2d) 
PASS DOMMatrixReadOnly stringifier: 1/300000000 (3d) 
PASS DOMMatrixReadOnly stringifier: 100000 + (1/3) (2d) 
PASS DOMMatrixReadOnly stringifier: 100000 + (1/3) (3d) 
PASS DOMMatrixReadOnly stringifier: Math.pow(2, 53) + 1 (2d) 
PASS DOMMatrixReadOnly stringifier: Math.pow(2, 53) + 1 (3d) 
PASS DOMMatrixReadOnly stringifier: Math.pow(2, 53) + 2 (2d) 
PASS DOMMatrixReadOnly stringifier: Math.pow(2, 53) + 2 (3d) 
PASS DOMMatrixReadOnly stringifier: Number.MAX_VALUE (2d) 
PASS DOMMatrixReadOnly stringifier: Number.MAX_VALUE (3d) 
PASS DOMMatrixReadOnly stringifier: Number.MIN_VALUE (2d) 
PASS DOMMatrixReadOnly stringifier: Number.MIN_VALUE (3d) 
PASS DOMMatrixReadOnly stringifier: throwing getters (2d) 
PASS DOMMatrixReadOnly stringifier: throwing getters (3d) 
PASS WebKitCSSMatrix stringifier: identity (2d) 
FAIL WebKitCSSMatrix stringifier: identity (3d) self[constr].fromMatrix is not a function
FAIL WebKitCSSMatrix stringifier: NaN (2d) Failed to construct 'WebKitCSSMatrix': Failed to parse '1,0,0,1,0,NaN'.
FAIL WebKitCSSMatrix stringifier: NaN (3d) Failed to construct 'WebKitCSSMatrix': Failed to parse '1,0,0,0,0,1,0,0,0,0,1,0,0,NaN,0,1'.
FAIL WebKitCSSMatrix stringifier: Infinity (2d) Failed to construct 'WebKitCSSMatrix': Failed to parse '1,0,0,1,0,Infinity'.
FAIL WebKitCSSMatrix stringifier: Infinity (3d) Failed to construct 'WebKitCSSMatrix': Failed to parse '1,0,0,0,0,1,0,0,0,0,1,0,0,Infinity,0,1'.
FAIL WebKitCSSMatrix stringifier: -Infinity (2d) Failed to construct 'WebKitCSSMatrix': Failed to parse '1,0,0,1,0,-Infinity'.
FAIL WebKitCSSMatrix stringifier: -Infinity (3d) Failed to construct 'WebKitCSSMatrix': Failed to parse '1,0,0,0,0,1,0,0,0,0,1,0,0,-Infinity,0,1'.
FAIL WebKitCSSMatrix stringifier: 1/3 (2d) Failed to construct 'WebKitCSSMatrix': Failed to parse '1,0,0,1,0,0.3333333333333333'.
FAIL WebKitCSSMatrix stringifier: 1/3 (3d) Failed to construct 'WebKitCSSMatrix': Failed to parse '1,0,0,0,0,1,0,0,0,0,1,0,0,0.3333333333333333,0,1'.
FAIL WebKitCSSMatrix stringifier: 1/300000 (2d) Failed to construct 'WebKitCSSMatrix': Failed to parse '1,0,0,1,0,0.0000033333333333333333'.
FAIL WebKitCSSMatrix stringifier: 1/300000 (3d) Failed to construct 'WebKitCSSMatrix': Failed to parse '1,0,0,0,0,1,0,0,0,0,1,0,0,0.0000033333333333333333,0,1'.
FAIL WebKitCSSMatrix stringifier: 1/300000000 (2d) Failed to construct 'WebKitCSSMatrix': Failed to parse '1,0,0,1,0,3.3333333333333334e-9'.
FAIL WebKitCSSMatrix stringifier: 1/300000000 (3d) Failed to construct 'WebKitCSSMatrix': Failed to parse '1,0,0,0,0,1,0,0,0,0,1,0,0,3.3333333333333334e-9,0,1'.
FAIL WebKitCSSMatrix stringifier: 100000 + (1/3) (2d) Failed to construct 'WebKitCSSMatrix': Failed to parse '1,0,0,1,0,100000.33333333333'.
FAIL WebKitCSSMatrix stringifier: 100000 + (1/3) (3d) Failed to construct 'WebKitCSSMatrix': Failed to parse '1,0,0,0,0,1,0,0,0,0,1,0,0,100000.33333333333,0,1'.
FAIL WebKitCSSMatrix stringifier: Math.pow(2, 53) + 1 (2d) Failed to construct 'WebKitCSSMatrix': Failed to parse '1,0,0,1,0,9007199254740992'.
FAIL WebKitCSSMatrix stringifier: Math.pow(2, 53) + 1 (3d) Failed to construct 'WebKitCSSMatrix': Failed to parse '1,0,0,0,0,1,0,0,0,0,1,0,0,9007199254740992,0,1'.
FAIL WebKitCSSMatrix stringifier: Math.pow(2, 53) + 2 (2d) Failed to construct 'WebKitCSSMatrix': Failed to parse '1,0,0,1,0,9007199254740994'.
FAIL WebKitCSSMatrix stringifier: Math.pow(2, 53) + 2 (3d) Failed to construct 'WebKitCSSMatrix': Failed to parse '1,0,0,0,0,1,0,0,0,0,1,0,0,9007199254740994,0,1'.
FAIL WebKitCSSMatrix stringifier: Number.MAX_VALUE (2d) Failed to construct 'WebKitCSSMatrix': Failed to parse '1,0,0,1,0,1.7976931348623157e+308'.
FAIL WebKitCSSMatrix stringifier: Number.MAX_VALUE (3d) Failed to construct 'WebKitCSSMatrix': Failed to parse '1,0,0,0,0,1,0,0,0,0,1,0,0,1.7976931348623157e+308,0,1'.
FAIL WebKitCSSMatrix stringifier: Number.MIN_VALUE (2d) Failed to construct 'WebKitCSSMatrix': Failed to parse '1,0,0,1,0,5e-324'.
FAIL WebKitCSSMatrix stringifier: Number.MIN_VALUE (3d) Failed to construct 'WebKitCSSMatrix': Failed to parse '1,0,0,0,0,1,0,0,0,0,1,0,0,5e-324,0,1'.
PASS WebKitCSSMatrix stringifier: throwing getters (2d) 
FAIL WebKitCSSMatrix stringifier: throwing getters (3d) self[constr].fromMatrix is not a function
Harness: the test ran to completion.