MathML support is very important. MathJAX does not work well when viewing content off-line.
Please PLEASE support DANE. There is already partial support in FireFox via an add-on, though it is not developed by Mozilla.
For me, I use DANE as a form of two-factor authentication for my TLS certificates. All my DNS servers use DNSSEC and all my TLS certificates do have TLSA records in DNS but I do not see DANE as replacing certificate authorities, as a user I like two forms of authentication from websites. The trusted CA is one form, the fingerprint in a DNSSEC signed TLSA record is the second form.
DANE is better than HPKP for this because HPKP records are not signed, making them Trust On First Use. I prefer Validate On Every Use which is what DANE does for me.
Thank you for your time.
Please implement this. I frequently use _blank as a target because my content often sites other sources the viewer may wish to skim without losing their place in my content, and I was rather shocked to find out the behaviour this attribute adds isn't the default. This is important.