fix: Precedence of element styles over other styles

Signed-off-by: Dmitry Dygalo <dmitry@dygalo.dev>

Author: Stranger6667

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Fixed
+
+- Precedence of element styles over other styles. [#364](https://github.com/Stranger6667/css-inline/issues/364)
+
 ## [0.14.0] - 2024-04-01
 
 ### Added

bindings/c/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Fixed
+
+- Precedence of element styles over other styles. [#364](https://github.com/Stranger6667/css-inline/issues/364)
+
 ## [0.14.0] - 2024-04-01
 
 ### Added

bindings/javascript/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Fixed
+
+- Precedence of element styles over other styles. [#364](https://github.com/Stranger6667/css-inline/issues/364)
+
 ## [0.14.0] - 2024-04-01
 
 ### Added

bindings/python/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Fixed
+
+- Precedence of element styles over other styles. [#364](https://github.com/Stranger6667/css-inline/issues/364)
+
 ## [0.14.0] - 2024-04-01
 
 ### Added

bindings/ruby/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Fixed
+
+- Precedence of element styles over other styles. [#364](https://github.com/Stranger6667/css-inline/issues/364)
+
 ## [0.14.0] - 2024-04-01
 
 ### Added

css-inline/src/html/serializer.rs

@@ -486,6 +486,8 @@ fn merge_styles<Wr: Write>(
             declarations_buffer.push(buffer);
         };
     }
+    // Keep the number of current declarations to write them last as they have the precedence
+    let current_declarations_count = parsed_declarations_count;
     // Next, we iterate over the new styles and merge them into our existing set
     // New rules will not override old ones unless they are marked as `!important`
     for (property, (_, value)) in new_styles {
@@ -532,13 +534,20 @@ fn merge_styles<Wr: Write>(
     }
 
     let mut first = true;
-    for declaration in &declarations_buffer[..parsed_declarations_count] {
-        if first {
-            first = false;
-        } else {
-            writer.write_all(b";")?;
+    for range in [
+        // First, write the new rules
+        current_declarations_count..parsed_declarations_count,
+        // Then, write the current rules
+        0..current_declarations_count,
+    ] {
+        for declaration in &declarations_buffer[range] {
+            if first {
+                first = false;
+            } else {
+                writer.write_all(b";")?;
+            }
+            writer.write_all(declaration)?;
         }
-        writer.write_all(declaration)?;
     }
     Ok(())
 }

css-inline/tests/test_inlining.rs

@@ -157,9 +157,9 @@ fn specificity_same_selector() {
     padding: 10px;
     padding-left: 12px;
 }"#,
-        body = r#"<a class="test-class" href="https://example.com">Test</a>"#,
+        body = r#"<a class="test-class">Test</a>"#,
         // Then the final style should come from the more specific selector
-        expected = r#"<a class="test-class" href="https://example.com" style="padding-top: 15px;padding: 10px;padding-left: 12px;">Test</a>"#
+        expected = r#"<a class="test-class" style="padding-top: 15px;padding: 10px;padding-left: 12px;">Test</a>"#
     )
 }
 
@@ -181,7 +181,16 @@ fn specificity_different_selectors_existing_style() {
 .test { padding-left: 16px; }
 h1 { padding: 0; }"#,
         body = r#"<h1 class="test" style="color: blue;"></h1>"#,
-        expected = r#"<h1 class="test" style="color: blue;padding: 0;padding-left: 16px"></h1>"#
+        expected = r#"<h1 class="test" style="padding: 0;padding-left: 16px;color: blue"></h1>"#
+    )
+}
+
+#[test]
+fn specificity_merge_with_existing_style() {
+    assert_inlined!(
+        style = ".test { padding: 0; }",
+        body = r#"<h1 class="test" style="padding-left: 16px"></h1>"#,
+        expected = r#"<h1 class="test" style="padding: 0;padding-left: 16px"></h1>"#
     )
 }
 
@@ -243,7 +252,7 @@ fn important_no_rule_exists() {
     assert_inlined!(
         style = "h1 { color: blue !important; }",
         body = r#"<h1 style="margin:0">Big Text</h1>"#,
-        expected = r#"<h1 style="margin: 0;color: blue">Big Text</h1>"#
+        expected = r#"<h1 style="color: blue;margin: 0">Big Text</h1>"#
     )
 }
 
@@ -382,7 +391,7 @@ fn existing_styles_with_merge() {
         body = r#"<h1 style="color: blue">Hello world!</h1>"#,
         // Then the existing rule should be preferred
         // And the new style should be merged
-        expected = r#"<h1 style="color: blue;font-size: 14px">Hello world!</h1>"#
+        expected = r#"<h1 style="font-size: 14px;color: blue">Hello world!</h1>"#
     )
 }
 
@@ -397,7 +406,7 @@ fn existing_styles_with_merge_multiple_tags() {
             r#"<h1 style="color: blue">Hello world!</h1><h1 style="color: blue">Hello world!</h1>"#,
         // Then the existing rule should be preferred
         // And the new style should be merged
-        expected = r#"<h1 style="color: blue;font-size: 14px">Hello world!</h1><h1 style="color: blue;font-size: 14px">Hello world!</h1>"#
+        expected = r#"<h1 style="font-size: 14px;color: blue">Hello world!</h1><h1 style="font-size: 14px;color: blue">Hello world!</h1>"#
     )
 }