add this attribute in place of ‘formaction’

<button onClick="location='./showDetail.html';">submit</button>

I hope it worked 🙂

I don’t know why this is not working, when I am submitting the code the shoDetail.html page is not opening. I had also tried by entering the complete URL but still not working.
I am sharing the code with you.

<div class="form-group row">
<div class="col-lg-12 col-md-12 col-sm-12 col-xs-12" >
<button  type="submit" style="margin-left: 70% " class ="btn btn-primary" class="form-control" formaction="showDetail.html">submit</button>
<button type="reset" class="btn" >cancel</button>
</div>
</div>
</form>
</body>

I had tried with formation on form tag and also tried to call showDetail at onsubmit event .
there is no error shown on the console while I am inspecting the code.