Fixed tables: Compute column computed widths from assignable table width

Is table treated as fixed?

table width:auto is not treated as fixed.

200
min

table width:px is treated as fixed.

200
min

table width:min-content is treated as fixed.

200
min

Fixed only

Table: 50px; C0:100/50/100 C1:100/50/75 When table.css_width is < columns.css_width, how is the conflict resolved? columns.css_width wins

50
50
50
25

Table: 300px; C0:100/100/200 C1:100/90/115 When table.css_width is > columns.css_width , how is the conflict resolved? table.css_width wins

100
100
90
25

Table: 300px; C0:100/50/50 C1:100/100/100 Fixed cells must grow, but their min widths differ. Fixed cells grow in proportion to their css width.

50
100

Table: 50px; C0:100/50/50 C1:100/100/100 What happens when column.min_width > column.css_width column.css_width wins over column.min_width.

Table: 1px. What happens to min_width when multiple cells specify css_width of the same column? 1st cell wins.

200
150

Auto only

Width is distributed evenly

Colspan distribution

Table: 1px Does column.min_width change with colspan distribution from later rows to first row? No

Table: 632px Does column.percent change with colspan distribution? No.

auto

Colspan header cells

  1. Fixed/percentage colspan cells get distributed evenly.
  2. Auto cells

Assignable: 400px Fixed header cells with colspan. Columns divded evenly

Legacy Chrome is slightly off, something about spacing and wide cells.

108 208
1 1 1 1

Assignable: 400px, C0:40% C1:20% C2:40% Percentage header cells with colspan C0 splits into C0.0 and C0.1, 16px each with 20% C1 splits into C1.0 and C1.1, 6px each with 10% Assignable width is 400, everyone gets according to percent. 80/80/40/40/160.

Firefox is slightly off, with C2 taking 6px more. Unknown what math is used to get this answer.
Auto Auto Auto Auto Auto

Assignable: 1px, C0 Auto/100 colspan=2 , C1 100/Auto Auto header cells with colspan, table is min width min_width does not get redistributed.

100
 100
x x x

Assignable: 200; C0: colspan:2 Auto C1:colspan 8 Auto Auto colspan cells, and nothing else. Tricky because this means that internally table has to represent 8 cells, and wide cells that span beyond table width are usually truncated. C0: 20*2+8=48, C1: 20*8 + 7*8=216

Percentage only

Assignable: 100px;columns add to 100%, auto width Columns are exact percentage size.

50% 30% 20%

Assignable: 100px;columns add to 50%, auto width Columns grow proportional to percent.

25% 15% 10%

Assignable: 100px;columns add to 50%, with min width Min width is ignored.

50
50
50

Assignable: 100px;columns add to 1000% Columns are scaled so they add up to 100%

50
50
50

Percentage/auto/fixed mix

Assignable: 100px;C0:50% C1:100px C2: Auto C0, C1 get assigned values, C2 fills the rest.

50% 30px

Assignable: 100px;C0:50% C1:50px Clean split

50% 50px

Assignable: 100px;C0:20% C1:60% C2:60px Overconstrained: widths add up to 140. Fixed widths get distributed first, percentage takes the rest.

20% 60% 60px

Fixed 0-width columns

Fixed 0-width columns are an exception. They are treated as a mix of fixed and auto columns.

  • If there are only zero-width columns, width is distibuted evenly.
  • If there are any fixed,percentage, or auto columns, 0-width columns do not grow.

    • Assignable: 100px;C0:0-width, C1:0-width All 0-width columns grow.

    0 0

    Assignable: 100px;C0:0-width, C1:auto 0-width column does not grow.

    0 0

    Assignable: 100px;C0:0-width, C1:50px 0-width column does not grow.

    0 0

    Assignable: 100px;C0:0-width, C1:50% 0-width column does not grow.

    0 0