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[dotfiles/.git] / .config / coc / extensions / node_modules / coc-prettier / node_modules / stylelint / lib / rules / declaration-block-no-duplicate-properties / README.md
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+# declaration-block-no-duplicate-properties
+
+Disallow duplicate properties within declaration blocks.
+
+```css
+a { color: pink; color: orange; }
+/** ↑            ↑
+ * These duplicated properties */
+```
+
+This rule ignores variables (`$sass`, `@less`, `--custom-property`).
+
+## Options
+
+### `true`
+
+The following patterns are considered violations:
+
+```css
+a { color: pink; color: orange; }
+```
+
+```css
+a { color: pink; background: orange; color: orange }
+```
+
+The following patterns are *not* considered violations:
+
+```css
+a { color: pink; }
+```
+
+```css
+a { color: pink; background: orange; }
+```
+
+## Optional secondary options
+
+### `ignore: ["consecutive-duplicates"]`
+
+Ignore consecutive duplicated properties.
+
+They can prove to be useful fallbacks for older browsers.
+
+The following patterns are considered violations:
+
+```css
+p {
+  font-size: 16px;
+  font-weight: 400;
+  font-size: 1rem;
+}
+```
+
+The following patterns are *not* considered violations:
+
+```css
+p {
+  font-size: 16px;
+  font-size: 1rem;
+  font-weight: 400;
+}
+```
+
+### `ignore: ["consecutive-duplicates-with-different-values"]`
+
+Ignore consecutive duplicated properties with different values.
+
+Including duplicate properties (fallbacks) is useful to deal with older browsers support for CSS properties. E.g. using 'px' units when 'rem' isn't available.
+
+The following patterns are considered violations:
+
+```css
+/* properties with the same value */
+p {
+  font-size: 16px;  
+  font-size: 16px;
+  font-weight: 400;
+}
+```
+
+```css
+/* nonconsecutive duplicates */
+p {
+  font-size: 16px;
+  font-weight: 400;
+  font-size: 1rem;
+}
+```
+
+The following patterns are *not* considered violations:
+
+```css
+p {
+  font-size: 16px;
+  font-size: 1rem;
+  font-weight: 400;
+}
+```
+
+### `ignoreProperties: ["/regex/", "non-regex"]`
+
+Ignore duplicates of specific properties.
+
+Given:
+
+```js
+["color", "/background\-/"]
+```
+
+The following patterns are considered violations:
+
+```css
+a { color: pink; background: orange; background: white; }
+```
+
+```css
+a { background: orange; color: pink; background: white; }
+```
+
+The following patterns are *not* considered violations:
+
+```css
+a { color: pink; color: orange; background-color: orange; background-color: white; }
+```
+
+```css
+a { color: pink; background-color: orange; color: orange; background-color: white; }
+```