Suffix not supported

This diagnostic detects when the .px, .%, and .em suffixes are used with an attribute binding.

<img [attr.width.px]="5" />

What's wrong with that?

These suffixes are only available for style bindings. They do not have any meaning when binding to an attribute.

Rather than using the .px, .%, or .em suffixes that are only supported in style bindings, move this to the value assignment of the binding.

<img [attr.width]="'5px'" />

strictTemplates must be enabled for any extended diagnostic to emit. suffixNotSupported has no additional requirements beyond strictTemplates.

This diagnostic can be disabled by editing the project's tsconfig.json file:

{
  "angularCompilerOptions": {
    "extendedDiagnostics": {
      "checks": {
        "suffixNotSupported": "suppress"
      }
    }
  }
}