| <!doctype html> |
| <title>Image width and height attributes are used to infer aspect-ratio</title> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="resources/aspect-ratio.js"></script> |
| <style> |
| img { |
| width: 100%; |
| max-width: 100px; |
| height: auto; |
| } |
| </style> |
| <img src="/images/green.png"> |
| <img src="/images/green.png" width=100 height=125> |
| <img src="" width=100 height=125> |
| <img src="error.png" width=100 height=125> |
| <img src="error.png"> |
| <img src="error.png" alt="Alt text" width=100 height=500> |
| <script> |
| let t = async_test("Image width and height attributes are used to infer aspect-ratio"); |
| function assert_ratio(img, expected, description) { |
| let epsilon = 0.001; |
| assert_approx_equals(parseFloat(getComputedStyle(img).width, 10) / parseFloat(getComputedStyle(img).height, 10), |
| expected, epsilon, description); |
| } |
| |
| function test_computed_style(width, height, expected) { |
| test_computed_style_aspect_ratio("img", {width: width, height: height}, expected); |
| test_computed_style_aspect_ratio("input", {type: "image", width: width, height: height}, expected); |
| // input type=submit should not do this mapping. |
| test_computed_style_aspect_ratio("input", {type: "submit", width: width, height: height}, "auto"); |
| } |
| |
| // Create and append a new image and immediately check the ratio. |
| // This is not racy because the spec requires the user agent to queue a task: |
| // https://html.spec.whatwg.org/multipage/images.html#updating-the-image-data |
| t.step(function() { |
| var img = new Image(); |
| img.width = 250; |
| img.height = 100; |
| img.src = "/images/blue.png"; |
| document.body.appendChild(img); |
| assert_ratio(img, 2.5); |
| |
| img = new Image(); |
| img.setAttribute("width", "0.8"); |
| img.setAttribute("height", "0.2"); |
| img.src = "/images/blue.png"; |
| document.body.appendChild(img); |
| assert_ratio(img, 4); |
| |
| img = new Image(); |
| img.setAttribute("width", "50%"); |
| img.setAttribute("height", "25%"); |
| img.src = "/images/blue.png"; |
| document.body.appendChild(img); |
| // Percentages should be ignored. |
| assert_equals(getComputedStyle(img).height, "0px"); |
| }); |
| |
| onload = t.step_func_done(function() { |
| let images = document.querySelectorAll("img"); |
| assert_ratio(images[0], 2.0, "2.0 is the original aspect ratio of green.png"); |
| assert_ratio(images[1], 2.0, "Loaded image's aspect ratio, at least by default, overrides width / height ratio."); |
| assert_ratio(images[2], 100/125, "aspect-ratio should override intrinsic size of images that don't have any src."); |
| assert_ratio(images[3], 100/125, "aspect-ratio should affect the size of error images."); |
| assert_not_equals(images[5].offsetHeight, 500, "Images with alt text should be inline and ignore the aspect ratio"); |
| assert_ratio(images[6], 133/106, "The original aspect ratio of blue.png"); |
| }); |
| |
| test(function() { |
| test_computed_style("10", "20", "auto 10 / 20"); |
| test_computed_style("0", "1", "auto 0 / 1"); |
| test_computed_style("1", "0", "auto 1 / 0"); |
| test_computed_style("0", "0", "auto 0 / 0"); |
| test_computed_style("0.5", "1.5", "auto 0.5 / 1.5"); |
| }, "Computed style"); |
| |
| test(function() { |
| test_computed_style(null, null, "auto"); |
| test_computed_style("10", null, "auto"); |
| test_computed_style(null, "20", "auto"); |
| test_computed_style("xx", "20", "auto"); |
| test_computed_style("10%", "20", "auto"); |
| }, "Computed style for invalid ratios"); |
| |
| </script> |
