What causes the discrepancy in element heights when looking at the code below?
<span id="spanner" style="margin:0;padding:0;border:0;outline:0;"><input type="text" /></span>
If you check the height of the text box, it will be shown as 16px. The reported height of the span is 19px (sometimes, IE shows 22px).
The default border and padding of the input element can vary depending on the browser. To remove this default styling, you can try the following:
<input type="text" style="padding: 0; border: 0" />
If you use Firebug in Firefox to inspect the element, you will see the actual padding, margin, and border values applied. In this case, you may observe a 2px border and a 1px padding at the top and bottom of the text field.
The dimensions of the textbox are influenced by its parent element, taking into account the border, padding, and margins.
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