Drawing from KQN's and Josh's interesting comments of 29 January and 31 January 2019 respectively.
The DF-26's accuracy improves with its manoeuvrable re-entry vehicle (in the terminal phase). It also likely uses Chinese BeiDou GPS, plus some form of seeker.
[Pete Research - Looking at the BeiDou GPS wiki entry the "restricted military service has a location accuracy of 10 centimetres" [ie 0.1m] (though footnote 53, Science China 2012 "proof" is now a "dead" link). So theoretically Chinese DF-21D ASBMs and DF-26 IRBMs may have a CEP of 1 meter!]
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There are some commercial satellite photos on the web, here (and see above) of Chinese land test targets simulating an aircraft carrier. You can clearly see the craters right in the middle of the target. Of course the target is not mobile while a US nuclear carrier is. The shorter (around 1,500 km minimum) range DF-21D's main targets are carriers including those in the main US northeast Asia naval base at Yokosuka, Japan. While the much longer (around 4,000 km) range DF-26 is for fixed targets like Andersen AFB Guam and the SSN naval base at Guam.
DF-21Ds and DF-26s might be deployed at the new 2nd artillery (missile) base on China's Hainan Island (with Chinese SSBNs based nearby). Like many Chinese bases, deep dug protective tunnels for missiles and submarines are likely.
It is worth noting again that geography and US foreign bases force the Chinese to test their weapons very far from the sea, like the desert in northwest China. The anti-ship targeting abilities of the DF-26 and DF-21D cannot be tested on an actual sea target. Test at sea would allow the US to learn about as much from the test as the Chinese. This has to impact Chinese confidence in these missiles somewhat.
[Pete Research - Looking at the BeiDou GPS wiki entry the "restricted military service has a location accuracy of 10 centimetres" [ie 0.1m] (though footnote 53, Science China 2012 "proof" is now a "dead" link). So theoretically Chinese DF-21D ASBMs and DF-26 IRBMs may have a CEP of 1 meter!]
Believed to be missile warhead craters in a Chinese desert, carrier sized, target. Satellite image originally in Want China Times (dead link) via Business Insider Australia, January 26, 2013 and reproduced in many other sources)
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There are some commercial satellite photos on the web, here (and see above) of Chinese land test targets simulating an aircraft carrier. You can clearly see the craters right in the middle of the target. Of course the target is not mobile while a US nuclear carrier is. The shorter (around 1,500 km minimum) range DF-21D's main targets are carriers including those in the main US northeast Asia naval base at Yokosuka, Japan. While the much longer (around 4,000 km) range DF-26 is for fixed targets like Andersen AFB Guam and the SSN naval base at Guam.
DF-21Ds and DF-26s might be deployed at the new 2nd artillery (missile) base on China's Hainan Island (with Chinese SSBNs based nearby). Like many Chinese bases, deep dug protective tunnels for missiles and submarines are likely.
There seems to be little evidence that the DF-26 has an anti-shipping warhead like DF-21D, but it is possible. The PLANs ability to target moving ships outside the first island chain is fairly limited right now so I wouldn't expect Chinese DF-21Ds and DF-26s to be deployed to hit ships outside the island chain yet.
It is worth noting again that geography and US foreign bases force the Chinese to test their weapons very far from the sea, like the desert in northwest China. The anti-ship targeting abilities of the DF-26 and DF-21D cannot be tested on an actual sea target. Test at sea would allow the US to learn about as much from the test as the Chinese. This has to impact Chinese confidence in these missiles somewhat.
A rough minimum range estimate, in kms, from Chinese launch points, estimated number of China's DF-21Ds and DF-26s, and some possible targets, are above.
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KQN, Josh and Pete