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In the Rendering section HTML5 recommends: http://www.w3.org/html/wg/drafts/html/master/rendering.html#form-controls [[ input[type="radio"], input[type="checkbox"], input[type="reset"], input[type="button"], input[type="submit"], select, button { box-sizing: border-box; } ]] Gecko and Webkit browser also include: input[type="search"] to have box-sizing: border-box. (Gecko's tools show this as -moz-box-sizing.) For web compat (especially on Mobile) the recommended default for search input types should be changed to match reality.
Making this a higher priority to actively seek more feedback on from implementers and webdevs.
HTML5.1 Bugzilla Bug Triage: Fixed (sometime in the past). The recommendation is already in the spec. If this resolution is not satisfactory, please copy the relevant bug details/proposal into a new issue at the W3C HTML5 Issue tracker: https://github.com/w3c/html/issues/new where it will be re-triaged. Thanks!