> When was the last time there was a major shift away from backwards compatibility in HTML/CSS? I don't think there has been... has there? The W3Schools page f

> When was the last time there was a major shift away from backwards compatibility in HTML/CSS? I don't think there has been... has there? The W3Schools page for <frame> says it is not supported in HTML 5 [0]. The MDN page for it warns that it may be removed from browsers at any time, though the compatibility table says it's still supported in every browser. [0] https://www.w3schools.com/tags/tag_frame.asp https://www.w3schools.com/tags/tag_frame.asp [1] https://developer.mozilla.org/en-US/docs/Web/HTML/Element/frame https://developer.mozilla.org/en-US/docs/Web/HTML/Element/fr...