gecko-dev/layout/reftests/high-contrast/backplate-bg-image-012-ref....

<!DOCTYPE html>
<title>Reference: Empty canvas objects and images that do not share lines with text should not receive backplates.</title>
<style>
  .outer {
    background-image: url("blue.png");
  }
  canvas {
    height: 100px;
    width: 100px;
  }
  .fake-backplate {
    background-color: white;
  }
</style>
<div class="outer">
  <canvas></canvas>
  <br>
  <img src="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg'></svg>" style="border:1px solid black; height:100px; width:100px;">
  <br>
  <span class="fake-backplate">Here is some alt text</span>
</div>
Bug 1594099: Use the visual overflow area of text-frame descendants (rather than entire lines) to determine the HCM backplate. r=dholbert The line-box's visual overflow area includes margin/border/padding area on its descendants, as well as extra empty space for text-indent and text-align. None of that area contains text & merits a backplate. So, we can't rely on the line-box's visual overflow area to determine the backplate -- we have to actually dig down to find the text frames. Also, this patch simplifies our suite of backplate reftests in several ways. Most notably, this patch: - removes unnecessary backplatable whitespace in the testcase (since that's awkward to mock up in the reference case). - uses a linear-gradient for the background instead of a longer data URI. - uses the predictably-sized Ahem font inside of tests' form controls. Differential Revision: https://phabricator.services.mozilla.com/D52065 --HG-- extra : moz-landing-system : lando 2019-12-11 22:19:20 +03:00			`<!DOCTYPE html>`
Bug 1614921 - Ignore background-image on canvas in high-contrast mode. r=morgan Let's give this a shot. Differential Revision: https://phabricator.services.mozilla.com/D63007 --HG-- extra : moz-landing-system : lando 2020-02-20 18:55:58 +03:00			`<title>Reference: Empty canvas objects and images that do not share lines with text should not receive backplates.</title>`
			`<style>`
			`.outer {`
Bug 1617678: Modify background image styling to only apply URL-sourced images when backplate is enabled. r=emilio Differential Revision: https://phabricator.services.mozilla.com/D64200 --HG-- extra : moz-landing-system : lando 2020-03-04 04:19:41 +03:00			`background-image: url("blue.png");`
Bug 1614921 - Ignore background-image on canvas in high-contrast mode. r=morgan Let's give this a shot. Differential Revision: https://phabricator.services.mozilla.com/D63007 --HG-- extra : moz-landing-system : lando 2020-02-20 18:55:58 +03:00			`}`
			`canvas {`
			`height: 100px;`
			`width: 100px;`
			`}`
			`.fake-backplate {`
			`background-color: white;`
			`}`
			`</style>`
			`<div class="outer">`
Bug 1594099: Use the visual overflow area of text-frame descendants (rather than entire lines) to determine the HCM backplate. r=dholbert The line-box's visual overflow area includes margin/border/padding area on its descendants, as well as extra empty space for text-indent and text-align. None of that area contains text & merits a backplate. So, we can't rely on the line-box's visual overflow area to determine the backplate -- we have to actually dig down to find the text frames. Also, this patch simplifies our suite of backplate reftests in several ways. Most notably, this patch: - removes unnecessary backplatable whitespace in the testcase (since that's awkward to mock up in the reference case). - uses a linear-gradient for the background instead of a longer data URI. - uses the predictably-sized Ahem font inside of tests' form controls. Differential Revision: https://phabricator.services.mozilla.com/D52065 --HG-- extra : moz-landing-system : lando 2019-12-11 22:19:20 +03:00			`<canvas></canvas>`
			`<br>`
			`<img src="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg'></svg>" style="border:1px solid black; height:100px; width:100px;">`
			`<br>`
			`<span class="fake-backplate">Here is some alt text</span>`
Bug 1614921 - Ignore background-image on canvas in high-contrast mode. r=morgan Let's give this a shot. Differential Revision: https://phabricator.services.mozilla.com/D63007 --HG-- extra : moz-landing-system : lando 2020-02-20 18:55:58 +03:00			`</div>`