We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

some of the tag is not working on this browser.

  • 1 reply
  • 1 has this problem
  • 1 view
  • Last reply by Shadow110

more options

I use some tag which is not working on this browser but working on another browser. Do I need to update my browser?

I use some tag which is not working on this browser but working on another browser. Do I need to update my browser?

All Replies (1)

more options

https://valentineday2018.com your site

W3C.org (World Wide Web Consortium) in charge of standards and practices and future development of web pages and web browsers make the rules on code. Mozilla Firefox follows these rules.

https://validator.w3.org/

HTML ERRORS https://validator.w3.org/nu/?doc=https%3A%2F%2Fvalentineday2018.com%2F

https://jigsaw.w3.org/css-validator/

CSS ERRORS https://jigsaw.w3.org/css-validator/validator?uri=https%3A%2F%2Fvalentineday2018.com&profile=css3svg&usermedium=all&warning=1&vextwarning=&lang=en

Clean up your code and any browser will display it and Google will also like it.

Please let us know if this solved your issue or if need further assistance.