Resource Hints: preconnect

Gives a hint to the browser to begin the connection handshake (DNS, TCP, TLS) in the background to improve performance. This is indicated using `<link rel="preconnect" href="https://example-domain.com/">`

W3C Working Draft: https://www.w3.org/TR/resource-hints/#preconnect

Usage: 95.6% + 0.09% = 95.7%

Support summary

Notes

  1. Firefox 39 did not support 'crossorigin' attribute and preconnects were not processed by the preload parser. Both of these features were enabled in Firefox 41.
  2. Partial support in Edge 15+ refers to support for only the HTTP header format, not the `<link rel>` format.
  3. Firefox support regressed from versions 71 - 114. See bug 1543990 for details.

Links

Full support table

IE

5.567891011
nnnnnnn

Edge

121314151617187980818384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137
nnnaaaayyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy

Firefox

233.53.6456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyynnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnyyyyyyyyyyyyyyyyyyyyyyyyyyyy

Chrome

4567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy

Safari

3.13.2455.166.177.1899.11010.11111.11212.11313.11414.11515.115.2-15.315.415.515.616.016.116.216.316.416.516.617.017.117.217.317.417.517.618.018.118.218.318.418.5TP
nnnnnnnnnnnnnnnyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy

Opera

99.5-9.610.0-10.110.510.61111.111.511.61212.11516171819202122232425262728293031323334353637383940414243444546474849505152535455565758606263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117
nnnnnnnnnnnnnnnnnnnnnnnnnnnnnyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy

Safari on iOS

3.24.0-4.14.2-4.35.0-5.16.0-6.17.0-7.188.1-8.49.0-9.29.310.0-10.210.311.0-11.211.3-11.412.0-12.112.2-12.513.0-13.113.213.313.4-13.714.0-14.414.5-14.815.0-15.115.2-15.315.415.515.6-15.816.016.116.216.316.416.516.6-16.717.017.117.217.317.417.517.6-17.718.018.118.218.318.418.5
nnnnnnnnnnnnnyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy

Opera Mini

all
n

Android Browser

2.12.22.3344.14.2-4.34.44.4.3-4.4.4137
nnnnnnnnny

Blackberry Browser

710
nn

Opera Mobile

101111.111.51212.180
nnnnnny

Chrome for Android

137
y

Firefox for Android

139
y

IE Mobile

1011
nn

UC Browser for Android

15.5
y

Samsung Internet

45.0-5.46.2-6.47.2-7.48.29.210.111.1-11.212.013.014.015.016.017.018.019.0202122232425262728
nyyyyyyyyyyyyyyyyyyyyyyyy

QQ Browser

14.9
y

Baidu Browser

13.52
y

KaiOS Browser

2.53.0-3.1
yy

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