[pjc50]

The amount of pain caused by HTML not having a "client-side include" is ridiculous. Server-side include is very old, but for various reasons having it client side would be easier for use cases like this.

(Security would have to be the same as <script>)

[creshal]

We could call it <frame>, or maybe <iframe> since all the cool kids use isomethings these days.

[pjc50]

Frames don't reflow. For headers etc people would want to integrate with the rest of the DOM.

[thomashabets2]

"seamless" iframes were meant to, right? Don't know what happened to that.

[charrondev]

Most headers today are expandable and need to be”open up” to take the full more of the screen when interacted with.

This is not possible with a frame.

[o11c]

Obligatory reminder that XSLT exists.