Auto merge of #18714 - jdm:sizes, r=jdm

Parse sizes attribute values

Squashed version of #17808.

---
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix (partially) #11416
- [x] There are tests for these changes

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/18714)
<!-- Reviewable:end -->

1 files changed, 4 insertions, 0 deletions

diff --git a/components/script/test.rs b/components/script/test.rs
index 0ff6811b14d..88baa21f42f 100644
--- a/components/script/test.rs
+++ b/components/script/test.rs
@@ -15,6 +15,10 @@ pub mod area {
     pub use dom::htmlareaelement::{Area, Shape};
 }
 
+pub mod sizes {
+    pub use dom::htmlimageelement::{parse_a_sizes_attribute, Size};
+}
+
 pub mod size_of {
     use dom::characterdata::CharacterData;
     use dom::element::Element;