Angular: How to restrict the compilation of rgba() to #rrggbbaa in your codebase

There are some browsers that do not support #rrggbbaa but do support rgba().
However, in my Angular project, 

background-color: rgba(58, 58, 58, 0.9)
in common.css was compiled to background-color:#3a3a3ae6 in style.[hash].css. How can I prevent this compilation from happening?
My project environment:

"@angular-devkit/build-angular": "~12.1.1",
"@angular-eslint/builder": "~12.0.0",
"@angular-eslint/eslint-plugin": "~12.0.0",
"@angular-eslint/eslint-plugin-template": "~12.0.0",
"@angular-eslint/template-parser": "~12.0.0",
"@angular/cli": "~12.1.1",
"@angular/compiler": "~12.1.1",
"@angular/compiler-cli": "~12.1.1",
"@angular/language-service": "~12.0.1",
cssangular

Answer №1

As shown in this source, currently the only browser not supporting HEXA is IE. As of angular 12, support for IE has been disabled, including for CSS.

If you require support for such a browser, there is a .browserslistrc file located in the angular project directory. For angular 12, the default values should be:

last 1 Chrome version
last 1 Firefox version
last 2 Edge major versions
last 2 Safari major versions
last 2 iOS major versions
Firefox ESR
not IE 11 # Angular only supports IE 11 as an opt-in. To opt-in, remove the 'not' prefix on this line.

According to the configuration, remove the not prefix from not IE 11.

It's important to note that additional JavaScript code will need to be generated to polyfill unsupported functions in IE11.

Alternative Solution

Alternatively, you can include that property in a style tag within your index.html. This method should also work effectively.

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