(Created on )
Puppeteer: Unsupported vision deficiency: {value}
Vision-deficiency emulation receives an unsupported value.
Vision-deficiency emulation receives an unsupported value.
Error message
Unsupported vision deficiency: {value}
{value} is replaced by the value shown in your error message.
How this error happens
Vision-deficiency emulation accepts specific identifiers. colorblind is a description, not one of those identifiers.
The snippets use an open Puppeteer page named page.
await page.emulateVisionDeficiency(
"colorblind"
);
How to fix
Choose the specific simulation you need, such as deuteranopia, or use none to reset it.
await page.emulateVisionDeficiency(
"deuteranopia"
);
Things to keep in mind
This is a rendering simulation, not a replacement for accessibility testing. The selected browser must support the emulation feature.