[Bug]: Invalid initial-value for custom CSS percentage property #1694
Description
Describe the bug
The initial-value of 0% in a custom CSS percentage property is incorrectly minified to 0, dropping the percent sign. The value 0 without the percent sign is invalid for properties defined with <percentage> syntax.
This issue occurs with both the default and advanced profiles. The lite profile correctly preserves the percent sign.
Input:
@property --ratio {
syntax: "<percentage>";
inherits: false;
initial-value: 0%;
}Output:
@property --ratio{syntax:"<percentage>";inherits:false;initial-value:0}Expected behaviour
The percent sign should be preserved in the minified output:
@property --ratio{syntax:"<percentage>";inherits:false;initial-value:0%}Steps to reproduce
- Open the sniped in the online playground.
- Minify using the default profile.
Version
7.0.6
Preset
default
Environment
System:
OS: macOS 15.4.1
CPU: (8) arm64 Apple M2
Memory: 152.61 MB / 24.00 GB
Shell: 5.9 - /bin/zshPackage details
├─┬ cssnano@7.0.6
│ ├─┬ cssnano-preset-default@7.0.6
│ │ ├─┬ css-declaration-sorter@7.2.0
│ │ │ └── postcss@8.5.3 deduped
│ │ ├─┬ cssnano-utils@5.0.0
│ │ │ └── postcss@8.5.3 deduped
│ │ ├─┬ postcss-calc@10.1.1
│ │ │ └── postcss@8.5.3 deduped
│ │ ├─┬ postcss-colormin@7.0.2
│ │ │ └── postcss@8.5.3 deduped
│ │ ├─┬ postcss-convert-values@7.0.4
│ │ │ └── postcss@8.5.3 deduped
│ │ ├─┬ postcss-discard-comments@7.0.3
│ │ │ └── postcss@8.5.3 deduped
│ │ ├─┬ postcss-discard-duplicates@7.0.1
│ │ │ └── postcss@8.5.3 deduped
│ │ ├─┬ postcss-discard-empty@7.0.0
│ │ │ └── postcss@8.5.3 deduped
│ │ ├─┬ postcss-discard-overridden@7.0.0
│ │ │ └── postcss@8.5.3 deduped
│ │ ├─┬ postcss-merge-longhand@7.0.4
│ │ │ ├── postcss@8.5.3 deduped
│ │ │ └─┬ stylehacks@7.0.4
│ │ │ └── postcss@8.5.3 deduped
│ │ ├─┬ postcss-merge-rules@7.0.4
│ │ │ └── postcss@8.5.3 deduped
│ │ ├─┬ postcss-minify-font-values@7.0.0
│ │ │ └── postcss@8.5.3 deduped
│ │ ├─┬ postcss-minify-gradients@7.0.0
│ │ │ └── postcss@8.5.3 deduped
│ │ ├─┬ postcss-minify-params@7.0.2
│ │ │ └── postcss@8.5.3 deduped
│ │ ├─┬ postcss-minify-selectors@7.0.4
│ │ │ └── postcss@8.5.3 deduped
│ │ ├─┬ postcss-normalize-charset@7.0.0
│ │ │ └── postcss@8.5.3 deduped
│ │ ├─┬ postcss-normalize-display-values@7.0.0
│ │ │ └── postcss@8.5.3 deduped
│ │ ├─┬ postcss-normalize-positions@7.0.0
│ │ │ └── postcss@8.5.3 deduped
│ │ ├─┬ postcss-normalize-repeat-style@7.0.0
│ │ │ └── postcss@8.5.3 deduped
│ │ ├─┬ postcss-normalize-string@7.0.0
│ │ │ └── postcss@8.5.3 deduped
│ │ ├─┬ postcss-normalize-timing-functions@7.0.0
│ │ │ └── postcss@8.5.3 deduped
│ │ ├─┬ postcss-normalize-unicode@7.0.2
│ │ │ └── postcss@8.5.3 deduped
│ │ ├─┬ postcss-normalize-url@7.0.0
│ │ │ └── postcss@8.5.3 deduped
│ │ ├─┬ postcss-normalize-whitespace@7.0.0
│ │ │ └── postcss@8.5.3 deduped
│ │ ├─┬ postcss-ordered-values@7.0.1
│ │ │ └── postcss@8.5.3 deduped
│ │ ├─┬ postcss-reduce-initial@7.0.2
│ │ │ └── postcss@8.5.3 deduped
│ │ ├─┬ postcss-reduce-transforms@7.0.0
│ │ │ └── postcss@8.5.3 deduped
│ │ ├─┬ postcss-svgo@7.0.1
│ │ │ └── postcss@8.5.3 deduped
│ │ ├─┬ postcss-unique-selectors@7.0.3
│ │ │ └── postcss@8.5.3 deduped
│ │ └── postcss@8.5.3 deduped
│ └── postcss@8.5.3 deduped
├─┬ postcss-cli@11.0.1
│ ├─┬ postcss-load-config@5.1.0
│ │ └── postcss@8.5.3 deduped
│ ├─┬ postcss-reporter@7.1.0
│ │ └── postcss@8.5.3 deduped
│ └── postcss@8.5.3 deduped
└── postcss@8.5.3Additional context
No response