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| ID | Project | Category | View Status | Date Submitted | Last Update | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0002121 | NetSurf | Layout | public | 2014-05-11 14:45 | 2014-07-19 09:34 | ||||||||
| Reporter | Chris Young | ||||||||||||
| Assigned To | Michael Drake | ||||||||||||
| Severity | minor | Reproducibility | always | ||||||||||
| Status | confirmed | Resolution | open | ||||||||||
| Platform | Amiga | OS | AmigaOS | OS Version | 4.1 | ||||||||
| Product Version | 3.2 | ||||||||||||
| Target Version | Fixed in Version | ||||||||||||
| Summary | 0002121: CSS alpha support | ||||||||||||
| Description | The lack of CSS (plotter?) alpha channel support is causing some pages to be unreadable without highlighting text. | ||||||||||||
| Steps To Reproduce | The Eurovision results pages (eg. http://www.eurovision.tv/page/results?event=1893&voter=UA) have all the information in boxes above a background image. On other web browsers these boxes are largely transparent, however on NetSurf they are opaque. Without the alpha channel they consist of black or white boxes with white text on top of them. | ||||||||||||
| Additional Information | I believe it is things like this in the CSS causing the problem: background:rgba(0,0,0,0.6) The two screenshots show the Amiga and GTK frontends display the page the same way. | ||||||||||||
| Tags | No tags attached. | ||||||||||||
| Fixed in CI build # | |||||||||||||
| Reported in CI build # | 1862 | ||||||||||||
| URL of problem page | http://www.eurovision.tv/page/results?event=1893&voter=UA | ||||||||||||
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| Notes |
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Michael Drake (administrator) 2014-07-19 09:34 |
The plotter interface could be extended to support rgba() backgrounds and colours. It would be a backwards incompatible change that would need all core and frontend code's handling of NS_TRANSPARENT changed. I may look at doing this. If the issue comes from the use of the CSS opacity property we can't do anything about it with the current layout engine. CSS opacity affects the descendants of a box as well as the box itself, so there would need to be some compositing of the rendering in a memory buffer, before plotting the result with opacity applied. |
| Notes |
| Issue History |
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| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2014-05-11 14:45 | Chris Young | New Issue | |
| 2014-05-11 14:45 | Chris Young | File Added: css_alpha.png | |
| 2014-05-11 14:51 | Chris Young | File Added: eu.png | |
| 2014-05-11 14:52 | Chris Young | Additional Information Updated | View Revisions |
| 2014-05-11 15:30 | Vincent Sanders | Assigned To | => Michael Drake |
| 2014-05-11 15:30 | Vincent Sanders | Status | new => confirmed |
| 2014-05-11 15:30 | Vincent Sanders | Description Updated | View Revisions |
| 2014-05-11 15:30 | Vincent Sanders | Steps to Reproduce Updated | View Revisions |
| 2014-05-11 15:30 | Vincent Sanders | Additional Information Updated | View Revisions |
| 2014-07-19 09:34 | Michael Drake | Note Added: 0000416 | |
| Issue History |