| <!DOCTYPE html> |
| <title>CSS Anchor Positioning Test: @position-fallback - tree scoped names</title> |
| <link rel="help" href="https://drafts.csswg.org/css-anchor-1/#fallback-rule"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/resources/declarative-shadow-dom-polyfill.js"></script> |
| |
| <style> |
| body { margin: 0; } |
| |
| @position-fallback --doc { |
| @try { |
| left: 100px; |
| } |
| } |
| |
| .abs { position: absolute; } |
| |
| #doc_pf_doc { position-fallback: --doc; } |
| #doc_pf_outer { position-fallback: --outer; } |
| #doc_pf_inner { position-fallback: --inner; } |
| </style> |
| |
| <div id="doc_pf_doc" class="abs"></div> |
| <div id="doc_pf_outer" class="abs"></div> |
| <div id="doc_pf_inner" class="abs"></div> |
| <div id="outer_host"> |
| <template shadowroot="open"> |
| <style> |
| @position-fallback --outer { |
| @try { |
| left: 200px; |
| } |
| } |
| |
| .abs { position: absolute; } |
| |
| #outer_pf_doc { position-fallback: --doc; } |
| #outer_pf_outer { position-fallback: --outer; } |
| #outer_pf_inner { position-fallback: --inner; } |
| </style> |
| <div id="outer_pf_doc" class="abs"></div> |
| <div id="outer_pf_outer" class="abs"></div> |
| <div id="outer_pf_inner" class="abs"></div> |
| <div id="inner_host"> |
| <template shadowroot="open"> |
| <style> |
| @position-fallback --inner { |
| @try { |
| left: 300px; |
| } |
| } |
| |
| .abs { position: absolute; } |
| |
| #inner_pf_doc { position-fallback: --doc; } |
| #inner_pf_outer { position-fallback: --outer; } |
| #inner_pf_inner { position-fallback: --inner; } |
| </style> |
| <div id="inner_pf_doc" class="abs"></div> |
| <div id="inner_pf_outer" class="abs"></div> |
| <div id="inner_pf_inner" class="abs"></div> |
| </template> |
| </div> |
| </template> |
| </div> |
| |
| <script> |
| setup(() => { |
| polyfill_declarative_shadow_dom(outer_host); |
| }); |
| |
| test(() => { |
| assert_equals(doc_pf_doc.offsetLeft, 100); |
| }, "Document position-fallback matches @position-fallback in document scope"); |
| |
| test(() => { |
| assert_equals(doc_pf_outer.offsetLeft, 0); |
| }, "Document position-fallback does not match @position-fallback in #outer_host scope"); |
| |
| test(() => { |
| assert_equals(doc_pf_inner.offsetLeft, 0); |
| }, "Document position-fallback does not match @position-fallback in #inner_host scope"); |
| |
| const outer_root = outer_host.shadowRoot; |
| const inner_root = outer_root.querySelector("#inner_host").shadowRoot; |
| |
| test(() => { |
| assert_equals(outer_root.querySelector("#outer_pf_doc").offsetLeft, 100); |
| }, "Outer position-fallback matches @position-fallback in document scope"); |
| |
| test(() => { |
| assert_equals(outer_root.querySelector("#outer_pf_outer").offsetLeft, 200); |
| }, "Outer position-fallback matches @position-fallback in #outer_host scope"); |
| |
| test(() => { |
| assert_equals(outer_root.querySelector("#outer_pf_inner").offsetLeft, 0); |
| }, "Outer position-fallback does not match @position-fallback in #inner_host scope"); |
| |
| test(() => { |
| assert_equals(inner_root.querySelector("#inner_pf_doc").offsetLeft, 100) |
| }, "Inner position-fallback matches @position-fallback in document scope"); |
| |
| test(() => { |
| assert_equals(inner_root.querySelector("#inner_pf_outer").offsetLeft, 200); |
| }, "Inner position-fallback matches @position-fallback in #outer_host scope"); |
| |
| test(() => { |
| assert_equals(inner_root.querySelector("#inner_pf_inner").offsetLeft, 300); |
| }, "Inner position-fallback matches @position-fallback in #inner_host scope"); |
| |
| </script> |
