| <!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"> |
| <link rel="help" href="https://drafts.csswg.org/css-scoping/#shadow-names"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.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 shadowrootmode="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 shadowrootmode="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> |
| |
| |
| <style> |
| @position-fallback --host-slot-part { |
| @try { |
| left: 1px; |
| } |
| } |
| #host_slotted_part::part(part) { |
| position-fallback: --host-slot-part; |
| } |
| </style> |
| <div id="host_slotted_part"> |
| <template shadowrootmode="open"> |
| <style> |
| @position-fallback --host-slot-part { |
| @try { |
| left: 2px; |
| } |
| } |
| ::slotted(#slotted), :host { |
| position: absolute; |
| position-fallback: --host-slot-part; |
| } |
| #part { |
| position: absolute; |
| } |
| </style> |
| <div id="part" part="part"></div> |
| <slot></slot> |
| </template> |
| <div id="slotted"></div> |
| </div> |
| |
| |
| <script> |
| 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"); |
| |
| test(() => { |
| assert_equals(host_slotted_part.offsetLeft, 2); |
| }, "@position-fallback from same scope as :host rule"); |
| |
| test(() => { |
| assert_equals(slotted.offsetLeft, 2); |
| }, "@position-fallback from same scope as ::slotted() rule"); |
| |
| test(() => { |
| assert_equals(host_slotted_part.shadowRoot.querySelector("#part").offsetLeft, 1); |
| }, "@position-fallback from same scope as ::part() rule"); |
| </script> |
