Mullany's company uncovered a CSS-related bug in which
Another issue involves inconsistent rendering after rotating content, which Firtman noted in Safari and Mullany noted in other apps. Mullany also cited the following issues:
- Launching and quitting the same home-screen app several times can hard-lock the device, requiring a hardware reboot.
- On iPad, if the document body is set to 100 percent height, content is shifted upwards by 20 pixels in landscape mode. This can be worked around by calling
window.scrollTo(0, 0)on the
- In certain cases, resizing a composited layer (an element with 3D transform) does not repaint it correctly. Instead, the cached bitmap is stretched.
- Scripts running within Web Workers are not suspended unless either the originating page is explicitly killed, or the Safari process is explicitly terminated. The three techniques you'd expect -- switching to another tab, minimizing Safari, or turning off the screen -- don't stop Web Worker execution. "This is a serious issue that allows any Web page to drain the battery of an iOS 7 device and slow down performance of the whole system without a user alert," Mullany wrote. It may be related to iOS 7's new multitasking feature, which keeps app running when you switch to others rather than suspending them as before -- except for a small number of background services that Apple allows to keep running.
Firtman has many other complaints, although most are not bugs but frustrations due to the new look of iOS 7 as well as Safari's full-screen mode, which causes several common hacks not to work any longer.
This story, "Bad news: iOS 7's HTML5 is full of bugs," was originally published at InfoWorld.com. Get the first word on what the important tech news really means with the InfoWorld Tech Watch blog. For the latest developments in business technology news, follow InfoWorld.com on Twitter.