Iframe youtube not working

Youtube iframe autoplay not working

<iframe id="existing-iframe-example"
          width="640" height="360"
          src="https://www.youtube.com/embed/-SFcIUEvNOQ?autoplay=1&mute=1&enablejsapi=1"
          frameborder="0"
          style="border: solid 4px #37474F"
          ></iframe>

Source: stackoverflow.com

Iframe youtube not working

<iframe width="560" height="315" src="https://www.youtube.com/embed/ZwKhufmMxko" frameborder="0" allowfullscreen></iframe>

Source: stackoverflow.com

Similar codes

2 votes116 views1 answer
How to link a number on website
Html
8 votes114 views1 answer
W3 schools
Html
1 vote102 views2 answers
Bootstrap multiselect dropdown with search stackoverflow
Html
0 vote117 views1 answer
How to make option colour black in html
Html
7 votes109 views2 answers
How to add multiple CSS inline html
Html
0 vote110 views2 answers
Click on tr redirect new page
Html
-1 vote111 views1 answer
Strong and bold difference in html
Html
1 vote107 views1 answer
Html_entity_decode
Html
8 votes99 views6 answers
Jumbotron bootstrap
Html
0 vote121 views1 answer
Table align center not working in github
Html