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The OES_standard_derivatives extension is part of the WebGL API and adds the GLSL derivative functions dFdx, dFdy, and fwidth.
OES_standard_derivatives
dFdx
dFdy
fwidth
MDN Reference
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The
OES_standard_derivativesextension is part of the WebGL API and adds the GLSL derivative functionsdFdx,dFdy, andfwidth.MDN Reference