This test setting suggested values on an input element 
and a textarea element. The dump below should have the "suggested value"
instead of "initial value".
| <input>
|   id="test"
|   type="text"
|   value="initial value"
|   this.value="initial value"
|   <shadow:root>
|     <div>
|       id="inner-editor"
|       "suggested value"
| <input>
|   id="month"
|   type="month"
|   this.value=""
|   <shadow:root>
|     <div>
|       datetimeformat="MMMM yyyy"
|       id="date-time-edit"
|       pseudo="-webkit-datetime-edit"
|       shadow:pseudoId="-webkit-datetime-edit"
|       <div>
|         pseudo="-webkit-datetime-edit-fields-wrapper"
|         shadow:pseudoId="-webkit-datetime-edit-fields-wrapper"
|         <span>
|           aria-help="Month"
|           aria-valuemax="12"
|           aria-valuemin="1"
|           aria-valuenow="1"
|           aria-valuetext="January"
|           pseudo="-webkit-datetime-edit-month-field"
|           role="spinbutton"
|           shadow:pseudoId="-webkit-datetime-edit-month-field"
|           "January"
|         <div>
|           pseudo="-webkit-datetime-edit-text"
|           shadow:pseudoId="-webkit-datetime-edit-text"
|           " "
|         <span>
|           aria-help="Year"
|           aria-valuemax="275760"
|           aria-valuemin="1"
|           aria-valuenow="2014"
|           aria-valuetext="2014"
|           pseudo="-webkit-datetime-edit-year-field"
|           role="spinbutton"
|           shadow:pseudoId="-webkit-datetime-edit-year-field"
|           "2014"
|     <div>
|       id="clear"
|       pseudo="-webkit-clear-button"
|       style=""
|       shadow:pseudoId="-webkit-clear-button"
|     <div>
|       id="spin"
|       pseudo="-webkit-inner-spin-button"
|       shadow:pseudoId="-webkit-inner-spin-button"
|     <div>
|       id="picker"
|       pseudo="-webkit-calendar-picker-indicator"
|       shadow:pseudoId="-webkit-calendar-picker-indicator"
| <textarea>
|   id="textarea"
|   this.value="initial value"
|   <shadow:root>
|     <div>
|       id="inner-editor"
|       "suggested value"
| <select>
|   id="select"
|   <option>
|     "CA"
|   <option>
|     "TX"
| "input.value: initial value"
| "internals.suggestedValue(input): suggested value"
| "input.selectionStart: 0"
| "input.selectionEnd: 0"
| "month.value: "
| "internals.suggestedValue(month): 2014-01"
| "textarea.value: initial value"
| "internals.suggestedValue(textarea): suggested value"
| "select.value: "
| "internals.suggestedValue(select): TX"