Deprecations and removals in Chrome 68
Deprecate and Remove Negative Brightness Values in Filter
For compliance with specification, filter's brightness() function no longer
accepts negative values.
Chromestatus Tracker | Chromium Bug
Remove document.createTouch
The document.createTouch() method is being removed because the Touch()
constructor has been supported since Chrome 48. This follows a long-standing
trend in JavaScript APIs of moving away from factory functions and toward
constructors. The closely-related document.createTouchList() method is
expected to be removed in Chrome 69.
Intent to Remove | Chromestatus Tracker | Chromium Bug
Remove Document.selectedStylesheetSet and Document.preferredStylesheetSet
The Document.selectedStylesheetSet and Document.preferredStylesheetSet attributes are removed because they are non-standard and only implemented by Chrome and WebKit. The standard versions of these attributes were removed from the spec in 2016.
Document.styleSheets provides some of the same functionality, thought not
all. Fortunately the risk to websites is low as the use of these items appears
to be in single digits. (See the Intent to Remove for exact numbers.)
Intent to Remove | Chromestatus Tracker | Chromium Bug
WEBGL_compressed_texture_atc
Previously, Chrome provided the AMD_compressed_ATC_texture_atc formats. These
formats were widely supported at the time the extension was created. Hardware
support has since dwindled to near-zero, with implementation currently possible
only on Qualcomm devices. This extension has been rejected by the WebGL Working
Group and support for it is now removed from Chrome.