如何通过label的一部分显示fieldset边框？

Question

I have a form with fieldsets, and would like to keep the border, but would like the border to be shown between some text legends. I can't get the legend to have a transparent background to let the border through (to be blocked by some text elements).

 legend { display:flex; justify-content:space-between; width: 100%; background-color: transparent; } legend div { background-color: white; margin-left:0.5em; margin-right:0.5em; }

 <form> <fieldset> <legend><div>Form Item</div><div>(extra 1)</div></legend> <label>Input:</label><input></input> </fieldset> </form>

Answer 1

Extra div hack. If there is a way to do this without the extra div, that would be great.

I guess if I force the fieldset border (chrome's default border is 2px groove threedface), it works ok.

 fieldset { border: 1px solid black; } legend { display:flex; justify-content:space-between; width: 100%; position: relative; } legend div { background-color: white; margin-left:0.5em; margin-right:0.5em; } legend div.line { flex: 1 1 auto; background-color: transparent; } legend div.line:before { position: absolute; z-index: -1; content: ''; left: 0px; right: 0px; top: 50%; border-top: 1px solid black; }

 <form> <fieldset> <legend><div>Form Item</div><div class="line"></div><div>(extra 1)</div></legend> <label>Input:</label><input></input> </fieldset> </form>

Answer 2

background can approximate this without an extra div. You simply need to find the correct color:

 fieldset { border: 1px solid black; } legend { display: flex; justify-content: space-between; width: 100%; background: linear-gradient(black 0 0)center/100% 1px no-repeat; } legend div { background-color: white; padding:0 0.5em; }

 <form> <fieldset> <legend> <div>Form Item</div> <div>(extra 1)</div> </legend> <label>Input:</label><input> </fieldset> </form>